Minor whitespace fixes

These have been done automatically by my editor (in the form of a post
save hook).

README.rst

@@ -53,7 +53,7 @@ can be installed from GitHub:
 
     $ pip install git+git://github.com/mwclient/mwclient.git
 
-Please see the 
+Please see the
 `release notes <https://github.com/mwclient/mwclient/blob/master/RELEASE-NOTES.md>`_
 for a list of changes.
 
@@ -111,7 +111,7 @@ without their two-letter prefix. Exceptions to this rule:
 * ``categorymembers`` is implemented as ``Category.members``
 * ``deletedrevs`` is ``deletedrevisions``
 * ``usercontribs`` is ``usercontributions``
-* First parameters of ``search`` and ``usercontributions`` are ``search`` and ``user`` 
+* First parameters of ``search`` and ``usercontributions`` are ``search`` and ``user``
   respectively
 
 Properties and generators are implemented as Python generators.