chore(package): update eslint to version 6.0.1

Closes #59

Author: greenkeeper[bot]

package.json

@@ -64,7 +64,7 @@
     "conventional-changelog-cli": "^2.0.1",
     "coveralls": "^3.0.0",
     "cz-conventional-changelog": "^2.0.0",
-    "eslint": "^5.1.0",
+    "eslint": "^6.0.1",
     "eslint-plugin-ava": "^4.2.2",
     "fetch-mock": "^6.5.0",
     "husky": "^0.14.3",