Merge pull request #122 from daniel-butler/patch-2

Fixing grammar

Author: nicoddemus

pytest_flask/fixtures.py

@@ -41,7 +41,7 @@ def test_login(self):
 
 
 class LiveServer:
-    """The helper class uses to manage live server. Handles creation and
+    """The helper class used to manage a live server. Handles creation and
     stopping application in a separate process.
 
     :param app: The application to run.