Add release notes for 2.5.0

Bump version to 2.5.0 for release

CHANGES.txt

 Changelog
 =========
-UNRELEASED / 3.0.0
+2.5.0 (2019-01-29)
 ------------------
+New checks:
+
+* E117: Over-indented code blocks
+* W505: Maximum doc-string length only when configured with --max-doc-length
+
 Changes:
 * Remove support for EOL Python 2.6 and 3.3. PR #720.
 * Add E117 error for over-indented code blocks.
+* Allow W605 to be silenced by `# noqa` and fix the position reported by W605
+* Allow users to omit blank lines around one-liner definitions of classes and
+  functions
+* Include the function return annotation (``->``) as requiring surrounding
+  whitespace only on Python 3
+* Verify that only names can follow ``await``. Previously we allowed numbers
+  and strings.
+* Add support for Python 3.7
+* Fix detection of annotated argument defaults for E252
+* Cprrect the position reported by W504
+
 2.4.0 (2018-04-10)
 ------------------

pycodestyle.py

@@ -78,7 +78,7 @@ try:
 except ImportError:
     from ConfigParser import RawConfigParser
-__version__ = '2.4.0'
+__version__ = '2.5.0'
 DEFAULT_EXCLUDE = '.svn,CVS,.bzr,.hg,.git,__pycache__,.tox'
 DEFAULT_IGNORE = 'E121,E123,E126,E226,E24,E704,W503,W504'