Bump to version 3.1.0

Author: Patrick Carey

docs/installation.rst

@@ -27,7 +27,7 @@ Using Docker
 
 shpkpr is also available in a prebuilt Docker image if you'd prefer to run it in a container. A list of the available tags can be found on the `Docker hub <https://hub.docker.com/r/shopkeep/shpkpr/tags/>`_::
 
-    $ docker pull shopkeep/shpkpr:v3.0.0
+    $ docker pull shopkeep/shpkpr:v3.1.0
     $ docker pull shopkeep/shpkpr:master
 
 Once the image is downloaded, you can use shpkpr with ``docker run``::

setup.py

@@ -17,7 +17,7 @@
 
 setup(
     name='shpkpr',
-    version='3.0.0',
+    version='3.1.0',
     description='shpkpr is a command-line tool designed to manage applications running on Marathon',
     long_description=readme,
     author='ShopKeep.com Inc.',

shpkpr/__init__.py

@@ -1,3 +1,3 @@
 # -*- coding: utf-8 -*-
 
-__version__ = '3.0.0'
+__version__ = '3.1.0'