chore(package): update eslint to version 6.7.2

Closes #47

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "blanket": "1.2.3",
     "codecov": "^3.0.0",
     "coveralls": "3.0.1",
-    "eslint": "5.0.0",
+    "eslint": "6.7.2",
     "eslint-config-standard": "12.0.0",
     "eslint-plugin-import": "2.12.0",
     "eslint-plugin-mocha": "5.0.0",