chore(package): update eslint to version 6.5.1

Closes #13

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "conventional-changelog-cli": "^1.2.0",
     "coveralls": "^2.11.14",
     "cz-conventional-changelog": "^1.2.0",
-    "eslint": "^3.7.1",
+    "eslint": "^6.5.1",
     "eslint-plugin-ava": "^4.0.0",
     "husky": "^0.12.0",
     "nyc": "^10.0.0",