diff --git a/yarn.lock b/yarn.lock
index 5e71d84..11eff2e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -20,13 +20,13 @@
     "@babel/plugin-transform-exponentiation-operator" "^7.0.0"
     "@babel/plugin-transform-modules-commonjs" "^7.0.0"
 
-"@ava/babel-preset-transform-test-files@^4.0.0":
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-4.0.0.tgz#95d426f5982f934567ae5a21e43eac0a463d6feb"
-  integrity sha512-V9hYHA/ZLb4I8imrrG8PT0mzgThjWWmahPV+mrQUZobVnsekBUDrf0JsfXVm4guS3binWxWn+MmQt+V81hTizA==
+"@ava/babel-preset-transform-test-files@^4.0.1":
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-4.0.1.tgz#6fb6fa04dc280adc192bccf93fee092391531803"
+  integrity sha512-D7Z92B8Rgsj35JZveKJGwpUDuBKLiRKH6eyKpNmDHy7TJjr8y3VSDr3bUK+O456F3SkkBXrUihQuMrr39nWQhQ==
   dependencies:
     "@ava/babel-plugin-throws-helper" "^3.0.0"
-    babel-plugin-espower "^3.0.0"
+    babel-plugin-espower "^3.0.1"
 
 "@ava/write-file-atomic@^2.2.0":
   version "2.2.0"
@@ -75,6 +75,17 @@
     source-map "^0.5.0"
     trim-right "^1.0.1"
 
+"@babel/generator@^7.3.0":
+  version "7.3.2"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.3.2.tgz#fff31a7b2f2f3dad23ef8e01be45b0d5c2fc0132"
+  integrity sha512-f3QCuPppXxtZOEm5GWPra/uYUjmNQlu9pbAD8D/9jze4pTY83rTtB1igTBSwvkeNlC5gR24zFFkz+2WHLFQhqQ==
+  dependencies:
+    "@babel/types" "^7.3.2"
+    jsesc "^2.5.1"
+    lodash "^4.17.10"
+    source-map "^0.5.0"
+    trim-right "^1.0.1"
+
 "@babel/helper-annotate-as-pure@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz#323d39dd0b50e10c7c06ca7d7638e6864d8c5c32"
@@ -654,6 +665,15 @@
     lodash "^4.17.10"
     to-fast-properties "^2.0.0"
 
+"@babel/types@^7.3.2":
+  version "7.3.2"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.3.2.tgz#424f5be4be633fff33fb83ab8d67e4a8290f5a2f"
+  integrity sha512-3Y6H8xlUlpbGR+XvawiH0UXehqydTmNmEpozWcXymqwcrwYAl5KMvKtQ+TF6f6E08V6Jur7v/ykdDSF+WDEIXQ==
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.17.10"
+    to-fast-properties "^2.0.0"
+
 "@concordance/react@^2.0.0":
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/@concordance/react/-/react-2.0.0.tgz#aef913f27474c53731f4fd79cc2f54897de90fde"
@@ -815,10 +835,10 @@ arr-union@^3.1.0:
   resolved "https://registry.yarnpkg.com/arr-union/-/arr-union-3.1.0.tgz#e39b09aea9def866a8f206e288af63919bae39c4"
   integrity sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=
 
-array-differ@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/array-differ/-/array-differ-1.0.0.tgz#eff52e3758249d33be402b8bb8e564bb2b5d4031"
-  integrity sha1-7/UuN1gknTO+QCuLuOVkuytdQDE=
+array-differ@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/array-differ/-/array-differ-2.0.3.tgz#0195bb00ccccf271106efee4a4786488b7180712"
+  integrity sha1-AZW7AMzM8nEQbv7kpHhkiLcYBxI=
 
 array-find-index@^1.0.1:
   version "1.0.2"
@@ -830,7 +850,7 @@ array-from@^2.1.1:
   resolved "https://registry.yarnpkg.com/array-from/-/array-from-2.1.1.tgz#cfe9d8c26628b9dc5aecc62a9f5d8f1f352c1195"
   integrity sha1-z+nYwmYoudxa7MYqn12PHzUsEZU=
 
-array-union@^1.0.1:
+array-union@^1.0.1, array-union@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/array-union/-/array-union-1.0.2.tgz#9a34410e4f4e3da23dea375be5be70f24778ec39"
   integrity sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=
@@ -906,16 +926,16 @@ atob@^2.1.1:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-ava@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/ava/-/ava-1.0.1.tgz#04be9a12ba60c55cfc869350ec04520ba3c94698"
-  integrity sha512-wTb9D14fytTeSOyNu+if6nzSni+MyEn9xgpJki2V5MiTbwMVtt4Svh40gCIos3k5Jqp1wXPCTZLIGKLpI965fQ==
+ava@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/ava/-/ava-1.2.1.tgz#c9b55fda5663fbfad88df37d5cdac56f29347c1b"
+  integrity sha512-EHqbPGdd8aNvlvRNL7liD1J9Auf9kByHj5Zi7zF7Z5ukn2ZStZgVBf7LSqirKIOWScB3XZzFQbO59SnTvzD5kA==
   dependencies:
     "@ava/babel-preset-stage-4" "^2.0.0"
-    "@ava/babel-preset-transform-test-files" "^4.0.0"
+    "@ava/babel-preset-transform-test-files" "^4.0.1"
     "@ava/write-file-atomic" "^2.2.0"
     "@babel/core" "^7.2.2"
-    "@babel/generator" "^7.2.2"
+    "@babel/generator" "^7.3.0"
     "@babel/plugin-syntax-async-generators" "^7.2.0"
     "@babel/plugin-syntax-object-rest-spread" "^7.2.0"
     "@babel/plugin-syntax-optional-catch-binding" "^7.2.0"
@@ -927,7 +947,7 @@ ava@^1.0.1:
     array-uniq "^2.0.0"
     arrify "^1.0.0"
     bluebird "^3.5.3"
-    chalk "^2.4.1"
+    chalk "^2.4.2"
     chokidar "^2.0.4"
     chunkd "^1.0.0"
     ci-parallel-vars "^1.0.0"
@@ -940,17 +960,17 @@ ava@^1.0.1:
     concordance "^4.0.0"
     convert-source-map "^1.6.0"
     currently-unhandled "^0.4.1"
-    debug "^4.1.0"
+    debug "^4.1.1"
     del "^3.0.0"
     dot-prop "^4.2.0"
     emittery "^0.4.1"
     empower-core "^1.2.0"
     equal-length "^1.0.0"
     escape-string-regexp "^1.0.5"
-    esm "^3.0.84"
+    esm "^3.1.3"
     figures "^2.0.0"
     find-up "^3.0.0"
-    get-port "^4.0.0"
+    get-port "^4.1.0"
     globby "^7.1.1"
     ignore-by-default "^1.0.0"
     import-local "^2.0.0"
@@ -972,22 +992,22 @@ ava@^1.0.1:
     md5-hex "^2.0.0"
     meow "^5.0.0"
     ms "^2.1.1"
-    multimatch "^2.1.0"
+    multimatch "^3.0.0"
     observable-to-promise "^0.5.0"
     ora "^3.0.0"
-    package-hash "^2.0.0"
+    package-hash "^3.0.0"
     pkg-conf "^2.1.0"
     plur "^3.0.1"
     pretty-ms "^4.0.0"
     require-precompiled "^0.1.0"
     resolve-cwd "^2.0.0"
     slash "^2.0.0"
-    source-map-support "^0.5.9"
+    source-map-support "^0.5.10"
     stack-utils "^1.0.2"
     strip-ansi "^5.0.0"
     strip-bom-buf "^1.0.0"
     supertap "^1.0.0"
-    supports-color "^5.5.0"
+    supports-color "^6.1.0"
     trim-off-newlines "^1.0.1"
     trim-right "^1.0.1"
     unique-temp-dir "^1.0.0"
@@ -1015,10 +1035,10 @@ babel-eslint@^10.0.1:
     eslint-scope "3.7.1"
     eslint-visitor-keys "^1.0.0"
 
-babel-plugin-espower@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/babel-plugin-espower/-/babel-plugin-espower-3.0.0.tgz#8dadfa5ec2b9c82e3c4aa0a2d14fbd3ff6d40061"
-  integrity sha512-f2IUz5kQyrwXnShcv7tvGxf76QkrEl00ENYgd6R0VMrz4xqlwBLZXFs5vse2vehs1Z+T2sXTP3UWX2QxMorzzw==
+babel-plugin-espower@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-espower/-/babel-plugin-espower-3.0.1.tgz#180db17126f88e754105b8b5216d21e520a6bd4e"
+  integrity sha512-Ms49U7VIAtQ/TtcqRbD6UBmJBUCSxiC3+zPc+eGqxKUIFO1lTshyEDRUjhoAbd2rWfwYf3cZ62oXozrd8W6J0A==
   dependencies:
     "@babel/generator" "^7.0.0"
     "@babel/parser" "^7.0.0"
@@ -1237,7 +1257,7 @@ caseless@~0.12.0:
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
   integrity sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
 
-chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.1, chalk@^2.4.1:
+chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
   integrity sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==
@@ -1246,6 +1266,15 @@ chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.1, chalk@^2.4.1:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
+chalk@^2.4.2:
+  version "2.4.2"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
+  integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
+  dependencies:
+    ansi-styles "^3.2.1"
+    escape-string-regexp "^1.0.5"
+    supports-color "^5.3.0"
+
 chardet@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/chardet/-/chardet-0.7.0.tgz#90094849f0937f2eedc2425d0d28a9e5f0cbad9e"
@@ -1597,7 +1626,7 @@ debug@^3.1.0:
   dependencies:
     ms "^2.1.1"
 
-debug@^4.0.1, debug@^4.1.0:
+debug@^4.0.1, debug@^4.1.0, debug@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
   integrity sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==
@@ -1958,10 +1987,10 @@ eslint@^5.11.0:
     table "^5.0.2"
     text-table "^0.2.0"
 
-esm@^3.0.84:
-  version "3.0.84"
-  resolved "https://registry.yarnpkg.com/esm/-/esm-3.0.84.tgz#bb108989f4673b32d4f62406869c28eed3815a63"
-  integrity sha512-SzSGoZc17S7P+12R9cg21Bdb7eybX25RnIeRZ80xZs+VZ3kdQKzqTp2k4hZJjR7p9l0186TTXSgrxzlMDBktlw==
+esm@^3.1.3:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.2.1.tgz#bd7c7dadad902ef167db93b266796e9cece587c7"
+  integrity sha512-+gxDed1gELD6mCn0P4TRPpknVJe7JvLtg3lJ9sRlLSpfw6J47QMGa5pi+10DN20VQ5z6OtbxjFoD9Z6PM+zb6Q==
 
 espower-location-detector@^1.0.0:
   version "1.0.0"
@@ -2349,7 +2378,7 @@ get-caller-file@^1.0.1:
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-1.0.3.tgz#f978fa4c90d1dfe7ff2d6beda2a515e713bdcf4a"
   integrity sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==
 
-get-port@^4.0.0:
+get-port@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/get-port/-/get-port-4.1.0.tgz#93eb3d5552c197497d76e9c389a6ac9920e20192"
   integrity sha512-4/fqAYrzrzOiqDrdeZRKXGdTGgbkfTEumGlNQPeP6Jy8w0PzN9mzeNQ3XgHaTNie8pQ3hOUkrwlZt2Fzk5H9mA==
@@ -2490,7 +2519,7 @@ got@^6.7.1:
     unzip-response "^2.0.1"
     url-parse-lax "^1.0.0"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.2:
+graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2:
   version "4.1.15"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.15.tgz#ffb703e1066e8a0eeaa4c8b80ba9253eeefbfb00"
   integrity sha512-6uHUhOPEBgQ24HM+r6b/QwWfZq+yiFcipKFrOFiBEnWdy5sdzYoi+pJeQaPI5qOLRFqWmAXUPQNsielzdLoecA==
@@ -2584,6 +2613,13 @@ has@^1.0.1:
   dependencies:
     function-bind "^1.1.1"
 
+hasha@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/hasha/-/hasha-3.0.0.tgz#52a32fab8569d41ca69a61ff1a214f8eb7c8bd39"
+  integrity sha1-UqMvq4Vp1BymmmH/GiFPjrfIvTk=
+  dependencies:
+    is-stream "^1.0.1"
+
 home-or-tmp@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/home-or-tmp/-/home-or-tmp-3.0.0.tgz#57a8fe24cf33cdd524860a15821ddc25c86671fb"
@@ -3025,7 +3061,7 @@ is-retry-allowed@^1.0.0:
   resolved "https://registry.yarnpkg.com/is-retry-allowed/-/is-retry-allowed-1.1.0.tgz#11a060568b67339444033d0125a61a20d564fb34"
   integrity sha1-EaBgVotnM5REAz0BJaYaINVk+zQ=
 
-is-stream@^1.0.0, is-stream@^1.1.0:
+is-stream@^1.0.0, is-stream@^1.0.1, is-stream@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
   integrity sha1-EtSj3U5o4Lec6428hBc66A2RykQ=
@@ -3578,7 +3614,7 @@ mimic-fn@^1.0.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"
   integrity sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ==
 
-minimatch@^3.0.0, minimatch@^3.0.3, minimatch@^3.0.4:
+minimatch@^3.0.3, minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==
@@ -3648,15 +3684,15 @@ ms@^2.1.1:
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
   integrity sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
 
-multimatch@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/multimatch/-/multimatch-2.1.0.tgz#9c7906a22fb4c02919e2f5f75161b4cdbd4b2a2b"
-  integrity sha1-nHkGoi+0wCkZ4vX3UWG0zb1LKis=
+multimatch@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/multimatch/-/multimatch-3.0.0.tgz#0e2534cc6bc238d9ab67e1b9cd5fcd85a6dbf70b"
+  integrity sha512-22foS/gqQfANZ3o+W7ST2x25ueHDVNWl/b9OlGcLpy/iKxjCpvcNCM51YCenUi7Mt/jAjjqv8JwZRs8YP5sRjA==
   dependencies:
-    array-differ "^1.0.0"
-    array-union "^1.0.1"
-    arrify "^1.0.0"
-    minimatch "^3.0.0"
+    array-differ "^2.0.3"
+    array-union "^1.0.2"
+    arrify "^1.0.1"
+    minimatch "^3.0.4"
 
 mute-stream@0.0.7:
   version "0.0.7"
@@ -4039,6 +4075,16 @@ package-hash@^2.0.0:
     md5-hex "^2.0.0"
     release-zalgo "^1.0.0"
 
+package-hash@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/package-hash/-/package-hash-3.0.0.tgz#50183f2d36c9e3e528ea0a8605dff57ce976f88e"
+  integrity sha512-lOtmukMDVvtkL84rJHI7dpTYq+0rli8N2wlnqUcBuDWCfVhRUfOmnR9SsoHFMLpACvEV60dX7rd0rFaYDZI+FA==
+  dependencies:
+    graceful-fs "^4.1.15"
+    hasha "^3.0.0"
+    lodash.flattendeep "^4.4.0"
+    release-zalgo "^1.0.0"
+
 package-json@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/package-json/-/package-json-4.0.1.tgz#8869a0401253661c4c4ca3da6c2121ed555f5eed"
@@ -4877,6 +4923,14 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
+source-map-support@^0.5.10:
+  version "0.5.10"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.10.tgz#2214080bc9d51832511ee2bab96e3c2f9353120c"
+  integrity sha512-YfQ3tQFTK/yzlGJuX8pTwa4tifQj4QS2Mj7UegOu8jAz59MqIiMGPXxQhVQiIMNzayuUSF/jEuVnfFF5JqybmQ==
+  dependencies:
+    buffer-from "^1.0.0"
+    source-map "^0.6.0"
+
 source-map-support@^0.5.9:
   version "0.5.9"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.9.tgz#41bc953b2534267ea2d605bccfa7bfa3111ced5f"
@@ -5073,6 +5127,13 @@ supports-color@^5.3.0, supports-color@^5.4.0, supports-color@^5.5.0:
   dependencies:
     has-flag "^3.0.0"
 
+supports-color@^6.1.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-6.1.0.tgz#0764abc69c63d5ac842dd4867e8d025e880df8f3"
+  integrity sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==
+  dependencies:
+    has-flag "^3.0.0"
+
 symbol-observable@^0.2.2:
   version "0.2.4"
   resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-0.2.4.tgz#95a83db26186d6af7e7a18dbd9760a2f86d08f40"