chore(package): update eslint to version 6.0.1

Closes #12

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "babel-plugin-transform-es2015-modules-commonjs": "^6.24.1",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-flow": "^6.23.0",
-    "eslint": "^4.0.0",
+    "eslint": "^6.0.1",
     "flow-bin": "^0.54.0",
     "random-words": "0.0.1",
     "rlp": "^2.0.0",