diff --git a/package.json b/package.json
index 322e68f..73ed6c6 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "@babel/polyfill": "7.8.7",
     "@babel/preset-env": "7.9.5",
     "@babel/register": "7.9.0",
-    "ava": "3.7.1",
+    "ava": "3.8.0",
     "coveralls": "3.1.0",
     "esdoc": "1.1.0",
     "esdoc-ecmascript-proposal-plugin": "1.0.0",
diff --git a/yarn.lock b/yarn.lock
index a59f7c3..86f3c43 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1011,6 +1011,11 @@ acorn-jsx@^5.2.0:
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.2.0.tgz#4c66069173d6fdd68ed85239fc256226182b2ebe"
   integrity sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==
 
+acorn-walk@^7.1.1:
+  version "7.1.1"
+  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-7.1.1.tgz#345f0dffad5c735e7373d2fec9a1023e6a44b83e"
+  integrity sha512-wdlPY2tm/9XBr7QkKlq0WQVgiuGTX6YWPyRyBviSoScBuLfTVQhvwg6wJ369GJ/1nPfTLMfnrFIfjqVg6d+jQQ==
+
 acorn@^2.1.0, acorn@^2.4.0:
   version "2.7.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-2.7.0.tgz#ab6e7d9d886aaca8b085bc3312b79a198433f0e7"
@@ -1291,21 +1296,23 @@ atob@^2.1.2:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-ava@3.7.1:
-  version "3.7.1"
-  resolved "https://registry.yarnpkg.com/ava/-/ava-3.7.1.tgz#7baba69820242e0efcbfb4ab2060b500ec745421"
-  integrity sha512-UX7RSenUgFPhxe866doqOJy6tQZAXAVAU4yufYeBAcnEjnS/plIcG6lE2yGIqgjk5cIMpSi+sP4f6EsornlsuA==
+ava@3.8.0:
+  version "3.8.0"
+  resolved "https://registry.yarnpkg.com/ava/-/ava-3.8.0.tgz#2429e2aa275a7ab0137e085606387fdb64e2c4e5"
+  integrity sha512-zpWqj0n1PvSzUmGHr0y7YLbS3U61vgRvBHxl7L/1pRQ+MSCgDuK/3vOruJ+SkT4p1Up8nlRbg84ve1LN4e1nRg==
   dependencies:
     "@concordance/react" "^2.0.0"
+    acorn "^7.1.1"
+    acorn-walk "^7.1.1"
     ansi-styles "^4.2.1"
     arrgv "^1.0.2"
     arrify "^2.0.1"
+    callsites "^3.1.0"
     chalk "^4.0.0"
-    chokidar "^3.3.1"
+    chokidar "^3.4.0"
     chunkd "^2.0.1"
     ci-info "^2.0.0"
     ci-parallel-vars "^1.0.0"
-    clean-stack "^2.2.0"
     clean-yaml-object "^0.1.0"
     cli-cursor "^3.1.0"
     cli-truncate "^2.1.0"
@@ -1325,13 +1332,13 @@ ava@3.7.1:
     indent-string "^4.0.0"
     is-error "^2.2.2"
     is-plain-object "^3.0.0"
-    is-promise "^2.1.0"
+    is-promise "^3.0.0"
     lodash "^4.17.15"
     matcher "^2.1.0"
     md5-hex "^3.0.1"
     mem "^6.1.0"
     ms "^2.1.2"
-    ora "^4.0.3"
+    ora "^4.0.4"
     p-map "^4.0.0"
     picomatch "^2.2.2"
     pkg-conf "^3.1.0"
@@ -1340,7 +1347,7 @@ ava@3.7.1:
     read-pkg "^5.2.0"
     resolve-cwd "^3.0.0"
     slash "^3.0.0"
-    source-map-support "^0.5.16"
+    source-map-support "^0.5.19"
     stack-utils "^2.0.1"
     strip-ansi "^6.0.0"
     supertap "^1.0.0"
@@ -1705,7 +1712,7 @@ call-me-maybe@^1.0.1:
   resolved "https://registry.yarnpkg.com/call-me-maybe/-/call-me-maybe-1.0.1.tgz#26d208ea89e37b5cbde60250a15f031c16a4d66b"
   integrity sha1-JtII6onje1y95gJQoV8DHBak1ms=
 
-callsites@^3.0.0:
+callsites@^3.0.0, callsites@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73"
   integrity sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==
@@ -1855,10 +1862,10 @@ chokidar@^2.1.8:
   optionalDependencies:
     fsevents "^1.2.7"
 
-chokidar@^3.3.1:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.3.1.tgz#c84e5b3d18d9a4d77558fef466b1bf16bbeb3450"
-  integrity sha512-4QYCEWOcK3OJrxwvyyAOxFuhpvOVCYkr33LPfFNBjAD/w3sEzWsp2BUOkI4l9bHvWioAd0rc6NlHUOEaWkTeqg==
+chokidar@^3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.4.0.tgz#b30611423ce376357c765b9b8f904b9fba3c0be8"
+  integrity sha512-aXAaho2VJtisB/1fg1+3nlLJqGOuewTzQpd/Tz0yTg2R0e4IGtshYvtjowyEumcBv2z+y4+kc75Mz7j5xJskcQ==
   dependencies:
     anymatch "~3.1.1"
     braces "~3.0.2"
@@ -1866,7 +1873,7 @@ chokidar@^3.3.1:
     is-binary-path "~2.1.0"
     is-glob "~4.0.1"
     normalize-path "~3.0.0"
-    readdirp "~3.3.0"
+    readdirp "~3.4.0"
   optionalDependencies:
     fsevents "~2.1.2"
 
@@ -1910,7 +1917,7 @@ clean-regexp@^1.0.0:
   dependencies:
     escape-string-regexp "^1.0.5"
 
-clean-stack@^2.0.0, clean-stack@^2.2.0:
+clean-stack@^2.0.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/clean-stack/-/clean-stack-2.2.0.tgz#ee8472dbb129e727b31e8a10a427dee9dfe4008b"
   integrity sha512-4diC9HaTE+KRAMWhDhrGOECgWZxoevMc5TlkObMqNSsVU62PYzXZ/SMTjzyGAFF1YusgxGcSWTEXBhp0CPwQ1A==
@@ -4356,6 +4363,11 @@ is-promise@^2.1.0:
   resolved "https://registry.yarnpkg.com/is-promise/-/is-promise-2.1.0.tgz#79a2a9ece7f096e80f36d2b2f3bc16c1ff4bf3fa"
   integrity sha1-eaKp7OfwlugPNtKy87wWwf9L8/o=
 
+is-promise@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-promise/-/is-promise-3.0.0.tgz#1f88031af842d9203dc1777cba40411e848f9beb"
+  integrity sha512-aTHJ4BvETyySzLhguH+7sL4b8765eecqq7ZrHVuhZr3FjCL/IV+LsvisEeH+9d0AkChYny3ad1KEL+mKy4ot7A==
+
 is-proto-prop@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/is-proto-prop/-/is-proto-prop-2.0.0.tgz#99ab2863462e44090fd083efd1929058f9d935e1"
@@ -5686,10 +5698,10 @@ optionator@^0.8.1, optionator@^0.8.3:
     type-check "~0.3.2"
     word-wrap "~1.2.3"
 
-ora@^4.0.3:
-  version "4.0.3"
-  resolved "https://registry.yarnpkg.com/ora/-/ora-4.0.3.tgz#752a1b7b4be4825546a7a3d59256fa523b6b6d05"
-  integrity sha512-fnDebVFyz309A73cqCipVL1fBZewq4vwgSHfxh43vVy31mbyoQ8sCH3Oeaog/owYOs/lLlGVPCISQonTneg6Pg==
+ora@^4.0.4:
+  version "4.0.4"
+  resolved "https://registry.yarnpkg.com/ora/-/ora-4.0.4.tgz#e8da697cc5b6a47266655bf68e0fb588d29a545d"
+  integrity sha512-77iGeVU1cIdRhgFzCK8aw1fbtT1B/iZAvWjS+l/o1x0RShMgxHUZaD2yDpWsNCPwXg9z1ZA78Kbdvr8kBmG/Ww==
   dependencies:
     chalk "^3.0.0"
     cli-cursor "^3.1.0"
@@ -5992,7 +6004,7 @@ performance-now@^2.1.0:
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
   integrity sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=
 
-picomatch@^2.0.4, picomatch@^2.0.5, picomatch@^2.0.7, picomatch@^2.2.1, picomatch@^2.2.2:
+picomatch@^2.0.4, picomatch@^2.0.5, picomatch@^2.2.1, picomatch@^2.2.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.2.tgz#21f333e9b6b8eaff02468f5146ea406d345f4dad"
   integrity sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==
@@ -6338,12 +6350,12 @@ readdirp@^2.2.1:
     micromatch "^3.1.10"
     readable-stream "^2.0.2"
 
-readdirp@~3.3.0:
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.3.0.tgz#984458d13a1e42e2e9f5841b129e162f369aff17"
-  integrity sha512-zz0pAkSPOXXm1viEwygWIPSPkcBYjW1xU5j/JBh5t9bGCJwa6f9+BJa6VaB2g+b55yVrmXzqkyLf4xaWYM0IkQ==
+readdirp@~3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.4.0.tgz#9fdccdf9e9155805449221ac645e8303ab5b9ada"
+  integrity sha512-0xe001vZBnJEK+uKcj8qOhyAKPzIT+gStxWr3LCB0DwcXR5NZJ3IaC+yGnHCYzB/S7ov3m3EEbZI2zeNvX+hGQ==
   dependencies:
-    picomatch "^2.0.7"
+    picomatch "^2.2.1"
 
 redent@^2.0.0:
   version "2.0.0"
@@ -6849,6 +6861,14 @@ source-map-support@^0.5.16:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
 
+source-map-support@^0.5.19:
+  version "0.5.19"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.19.tgz#a98b62f86dcaf4f67399648c085291ab9e8fed61"
+  integrity sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==
+  dependencies:
+    buffer-from "^1.0.0"
+    source-map "^0.6.0"
+
 source-map-url@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"