fix lint issue

Author: Robert S

tslint.json

@@ -2,7 +2,8 @@
   "extends": ["tslint:latest", "tslint-react", "tslint-config-prettier"],
   "jsRules": {
     "object-literal-sort-keys": false,
-    "no-console": [true, "log"]
+    "no-console": [true, "log"],
+    "variable-name": [true, "ban-keywords", "check-format", "allow-pascal-case", "allow-leading-underscore"]
   },
   "rules": {
     "array-type": [true, "array"],