fix(package): update eslint to version 6.1.0

Closes #4

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "babel-eslint": "^10.0.1",
     "canvas": "^2.0.1",
     "d3-node": "^2.1.0",
-    "eslint": "^5.4.0",
+    "eslint": "^6.1.0",
     "eslint-plugin-react": "^7.11.1",
     "mongodb": "^3.1.10",
     "node-wit": "^5.0.0",