chore(package): update eslint to version 6.2.0

Closes #20

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "@semantic-release/npm": "3.0.1",
     "commitplease": "3.2.0",
     "coveralls": "3.0.0",
-    "eslint": "4.17.0",
+    "eslint": "6.2.0",
     "eslint-config-scanjs": "1.0.0-beta4",
     "eslint-config-standard": "11.0.0-beta.0",
     "eslint-config-xo-space": "0.17.0",