chore(package): update eslint to version 6.0.1

Closes #113

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "babel-register": "^6.24.1",
     "chai": "^4.1.2",
     "del": "^3.0.0",
-    "eslint": "^4.2.0",
+    "eslint": "^6.0.1",
     "eslint-config-strict": "^14.0.0",
     "eslint-plugin-import": "^2.7.0",
     "estraverse-fb": "^1.3.1",