Fix content type for mbed-greentea readme

Author: madchutney

packages/mbed-greentea/setup.py

@@ -46,6 +46,7 @@ def read(fname):
       version='1.7.2',
       description=DESCRIPTION,
       long_description=read('README.md'),
+      long_description_content_type='text/markdown',
       author=OWNER_NAMES,
       author_email=OWNER_EMAILS,
       maintainer=OWNER_NAMES,