Include README.rst (instead of README.md) for PyPI

Add Contribute section to README

MANIFEST.in

@@ -1 +1 @@
-include README.md
+include README.rst

README.rst

@@ -21,7 +21,6 @@ A Python module for `semantic versioning`_. Simplifies comparing versions.
 .. |license| image:: https://img.shields.io/pypi/l/semver.svg
    :alt: Software license
    :target: https://github.com/k-bx/python-semver/blob/master/LICENSE.txt
-
 .. _semantic versioning: http://semver.org/
 
 Usage
@@ -69,3 +68,26 @@ For Python 3:
 .. code-block:: bash
 
     pip3 install semver
+
+How to Contribute
+-----------------
+
+When you make changes to the code please run the tests before pushing your
+code to your fork and opening a `pull request`_:
+
+.. code-block:: bash
+
+    python setup.py test
+
+We use `py.test`_ and `tox`_ to run tests against all supported Python
+versions.  All test dependencies are resolved automatically, apart from
+virtualenv, which for the moment you still may have to install manually:
+
+.. code-block:: bash
+
+    pip install "virtualenv<14.0.0"  # <14.0.0 needed for Python 3.2 only
+
+
+.. _pull request: https://github.com/k-bx/python-semver/pulls
+.. _py.test: http://pytest.org/
+.. _tox: http://tox.testrun.org/

setup.py

@@ -33,7 +33,7 @@ setup(
     name='semver',
     version='2.4.1',
     description='Python helper for Semantic Versioning (http://semver.org/)',
-    long_description=read_file('README.md'),
+    long_description=read_file('README.rst'),
     author='Konstantine Rybnikov',
     author_email='k-bx@k-bx.com',
     url='https://github.com/k-bx/python-semver',