Add root parameter to .eslintrc.json

Signed-off-by: João Victor Tozatti Risso <jvtr12@inf.ufpr.br>

.eslintrc.json

 {
     "extends": "airbnb",
+    "root": true,
     "plugins": [
         "react",
         "jsx-a11y",
@@ -8,6 +9,6 @@
     "rules": {
         "indent": [ "error", 4 ],
         "no-unused-vars": [ "error", { "args": "none" }],
-		"no-param-reassign": [ "off" ]
+        "no-param-reassign": [ "off" ]
     }
 }