build(deps): add abortcontroller-polyfill 1.7.6

Wasn't able to find some reputable solution from core-js for example. Wasn't able to pass node arguments through nyc too.

package.json

@@ -57,6 +57,7 @@
     "babel-plugin-istanbul": "^4.1.5",
     "chalk": "^2.3.0",
     "conventional-changelog-conventionalcommits": "^4.6.1",
+    "abortcontroller-polyfill": "^1.7.6",
     "coveralls": "^3.0.0",
     "inquirer": "^6.2.0",
     "nyc": "^12.0.1",

yarn.lock

@@ -598,6 +598,11 @@ abbrev@1, abbrev@~1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
 
+abortcontroller-polyfill@^1.7.6:
+  version "1.7.6"
+  resolved "https://registry.yarnpkg.com/abortcontroller-polyfill/-/abortcontroller-polyfill-1.7.6.tgz#7be8d35b5ed7dfa1a51b36f221720b23deb13f36"
+  integrity sha512-Zypm+LjYdWAzvuypZvDN0smUJrhOurcuBWhhMRBExqVLRvdjp3Z9mASxKyq19K+meZMshwjjy5S0lkm388zE4Q==
+
 agent-base@6, agent-base@^6.0.2:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-6.0.2.tgz#49fff58577cfee3f37176feab4c22e00f86d7f77"