Remove unused 'chai-subset' dependency

Author: IvanGoncharov

package.json

@@ -72,7 +72,6 @@
     "browserify": "^14.4.0",
     "browserify-shim": "^3.8.10",
     "chai": "^4.1.2",
-    "chai-subset": "^1.0.1",
     "coveralls": "^2.11.2",
     "eslint": "^4.6.0",
     "eslint-plugin-babel": "4.1.2",

scripts/mocha-bootload.js

@@ -7,11 +7,6 @@
  *  of patent rights can be found in the PATENTS file in the same directory.
  */
 
-var chai = require('chai');
-
-var chaiSubset = require('chai-subset');
-chai.use(chaiSubset);
-
 process.on('unhandledRejection', function(error) {
   console.error('Unhandled Promise Rejection:');
   console.error((error && error.stack) || error);

yarn.lock

@@ -1138,10 +1138,6 @@ center-align@^0.1.1:
     align-text "^0.1.3"
     lazy-cache "^1.0.3"
 
-chai-subset@^1.0.1:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/chai-subset/-/chai-subset-1.5.0.tgz#d03dbcfa8c9daad848643bbde4e63376b7882427"
-
 chai@^4.1.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/chai/-/chai-4.1.2.tgz#0f64584ba642f0f2ace2806279f4f06ca23ad73c"