Add comma space rule

Author: Nick Litwin

.eslintrc.json

@@ -17,6 +17,7 @@
     "one-var": [2, "never"],
     "eqeqeq": 2,
     "comma-style": 2,
+    "comma-spacing": ["error", {"before": false, "after": true}],
     "no-nested-ternary": 2,
     "no-unneeded-ternary": 2,
     "react/jsx-uses-vars": 2,