chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

yarn.lock

@@ -382,23 +382,13 @@ acorn-dynamic-import@^3.0.0:
   dependencies:
     acorn "^5.0.0"
 
-acorn-jsx@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-3.0.1.tgz#afdf9488fb1ecefc8348f6fb22f464e32a58b36b"
-  dependencies:
-    acorn "^3.0.4"
-
 acorn-jsx@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-4.1.1.tgz#e8e41e48ea2fe0c896740610ab6a4ffd8add225e"
   dependencies:
     acorn "^5.0.3"
 
-acorn@^3.0.4:
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
-
-acorn@^5.0.0, acorn@^5.0.3, acorn@^5.2.1, acorn@^5.5.0, acorn@^5.6.0, acorn@^5.6.2:
+acorn@^5.0.0, acorn@^5.0.3, acorn@^5.2.1, acorn@^5.6.0, acorn@^5.6.2:
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.1.tgz#f095829297706a7c9776958c0afc8930a9b9d9d8"
 
@@ -2802,16 +2792,18 @@ eslint-config-prettier@^2.9.0:
   dependencies:
     get-stdin "^5.0.1"
 
-eslint-plugin-ava@^4.5.1:
-  version "4.5.1"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-ava/-/eslint-plugin-ava-4.5.1.tgz#a51b89a306dfd5b2f91185e283837aeade6f9e5c"
+eslint-plugin-ava@^5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-ava/-/eslint-plugin-ava-5.1.1.tgz#709a03f6c56f9f316d83ebc739952cc28cea979a"
   dependencies:
     arrify "^1.0.1"
     deep-strict-equal "^0.2.0"
     enhance-visitors "^1.0.0"
-    espree "^3.1.3"
-    espurify "^1.5.0"
+    esm "^3.0.82"
+    espree "^4.0.0"
+    espurify "^1.8.1"
     import-modules "^1.1.0"
+    is-plain-object "^2.0.4"
     multimatch "^2.1.0"
     pkg-up "^2.0.0"
 
@@ -2923,6 +2915,10 @@ eslint@^5.1.0:
     table "^4.0.3"
     text-table "^0.2.0"
 
+esm@^3.0.82:
+  version "3.0.82"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.0.82.tgz#e8c4363a14e30936bedf49a44bf962e2c91866ff"
+
 espower-location-detector@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/espower-location-detector/-/espower-location-detector-1.0.0.tgz#a17b7ecc59d30e179e2bef73fb4137704cb331b5"
@@ -2932,13 +2928,6 @@ espower-location-detector@^1.0.0:
     source-map "^0.5.0"
     xtend "^4.0.0"
 
-espree@^3.1.3:
-  version "3.5.4"
-  resolved "https://registry.yarnpkg.com/espree/-/espree-3.5.4.tgz#b0f447187c8a8bed944b815a660bddf5deb5d1a7"
-  dependencies:
-    acorn "^5.5.0"
-    acorn-jsx "^3.0.0"
-
 espree@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/espree/-/espree-4.0.0.tgz#253998f20a0f82db5d866385799d912a83a36634"
@@ -2950,7 +2939,7 @@ esprima@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.1.tgz#13b04cdb3e6c5d19df91ab6987a8695619b0aa71"
 
-espurify@^1.5.0, espurify@^1.6.0:
+espurify@^1.6.0, espurify@^1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/espurify/-/espurify-1.8.1.tgz#5746c6c1ab42d302de10bd1d5bf7f0e8c0515056"
   dependencies: