grammar check

Author: IAmTomahawkx

docs/changelog.rst

@@ -6,7 +6,7 @@
     - Type the :class:`User` class
     - Update the library to use a proper ISO datetime parser.
     - Add event_raw_usernotice event (GH#229)
-    - :class:`User` fixed an issue where the User class couldnt fetch rewards (GH#214)
+    - :class:`User` fixed an issue where the User class couldn't fetch rewards (GH#214)
     - :class:`Chatter` fixed the docstring for the `badges` property
     - :func:`Chatter.is_subscriber` will now return True for founders
     - :class:`Client` change docstring on `fetch_channel`