Set the content type for displaying PyPi documentation

Author: matthewbalvanz-wf

setup.py

@@ -126,6 +126,7 @@ def read(filename):
     description=('Tools for creating and verifying consumer driven contracts'
                  ' using the Pact framework.'),
     long_description=read('README.md'),
+    long_description_content_type='text/markdown',
     author='Matthew Balvanz',
     author_email='[email protected]',
     url='https://github.com/pact-foundation/pact-python',