Update package.json (#86)

Linting options added as scripts to allow user to automatically fix whatever can be fixed with the  `--fix` tag.
The `lint` scripts lints all the errors, and the `lint-fix` script fixes what it can.

Author: Rubix982

package.json

@@ -10,7 +10,9 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",    
+    "lint": "eslint ./",
+    "lint-fix": "eslint ./ --fix"
   },
   "eslintConfig": {
     "extends": "react-app"