chore(package): update eslint to version 6.3.0

Closes #17

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "babel-preset-env": "^1.7.0",
     "babel-register": "^6.24.1",
     "common-tags": "^1.4.0",
-    "eslint": "^5.10.0",
+    "eslint": "^6.3.0",
     "eslint-config-airbnb": "^17.1.0",
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-plugin-import": "^2.14.0",