title: Error - Schema is not configured for mutations, although mutation included in the schema
body: <p>Although i have created a mutation and inserted it in graphql schema, it returns the error, Checked with other instances of same error there isn't any solution regarding the current issue </p>
  
  <pre><code>'schemas' =&gt; [
          'default' =&gt; [
              'query' =&gt; [
                  'articles' =&gt; App\GraphQL\Query\ArticlesQuery::class,
              ],
              'mutation' =&gt; [
                  'updatearticle' =&gt; App\GraphQL\Mutation\UpdateArticle::class
              ],
              'middleware' =&gt; [],
              'method' =&gt; ['get', 'post'],
          ],
      ],
  </code></pre>