Merge pull request #75 from rosette-api/eslint-upgrade

NO-JIRA:  Upgrade to latest eslint release.

Author: seth-mg

package.json

@@ -45,7 +45,7 @@
   "devDependencies": {
     "argparse": "^1.0.6",
     "chai": "^3.5.0",
-    "eslint": "^2.7.0",
+    "eslint": "^6.0.1",
     "grunt": "^0.4.5",
     "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-watch": "^0.6.1",