chore(package): update eslint to version 6.2.2

Closes #283

Author: greenkeeper[bot]

package.json

@@ -94,7 +94,7 @@
     "babel-preset-es2015": "^6.24.1",
     "chai": "^4.1.2",
     "coveralls": "^3.0.0",
-    "eslint": "^4.14.0",
+    "eslint": "^6.2.2",
     "istanbul": "^0.4.2",
     "mocha": "^4.1.0",
     "mocha-lcov-reporter": "^1.2.0"