fixing pre-commit warning

```
Some of your tasks use `git add` command. Please remove it from the config since
all modifications made by tasks will be automatically added to the git commit index.
```

Author: dennybiasiolli

package.json

@@ -12,8 +12,7 @@
   },
   "lint-staged": {
     "*.{js,vue}": [
-      "vue-cli-service lint",
-      "git add"
+      "vue-cli-service lint"
     ]
   },
   "dependencies": {