Update dependency eslint to v4.19.1 (#125)

Author: renovate[bot]

package-lock.json

@@ -22,7 +22,7 @@
     "babel-plugin-transform-runtime": "6.23.0",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-0": "6.24.1",
-    "eslint": "4.2.0",
+    "eslint": "4.19.1",
     "mocha": "5.1.0",
     "graphql": "0.13.2",
     "graphql-tools": "2.24.0",