Fix test version class name

Author: santos22

readthedocs/api/v3/tests/test_versions.py

@@ -8,7 +8,7 @@
 from readthedocs.projects.models import Project
 
 
-class VerionsEndpointTests(APIEndpointMixin):
+class VersionsEndpointTests(APIEndpointMixin):
 
     def test_projects_versions_list(self):
         self.client.credentials(HTTP_AUTHORIZATION=f'Token {self.token.key}')