Bump version and update changelog

Author: sloria

CHANGELOG.rst

@@ -1,6 +1,14 @@
 Changelog
 ---------
 
+0.5.0 (2018-03-04)
+++++++++++++++++++
+
+Features:
+
+* Allow a schema factory to be passed to `use_args` and `use_kwargs`
+  (:issue:`79`). Thanks :user:`decaz` for the PR.
+
 0.4.2 (2017-10-23)
 ++++++++++++++++++
 

flask_apispec/__init__.py

@@ -4,7 +4,7 @@
 from flask_apispec.extension import FlaskApiSpec
 from flask_apispec.utils import Ref
 
-__version__ = '0.4.2'
+__version__ = '0.5.0'
 __all__ = [
     'doc',
     'wrap_with',