Avoid converting readme to rST for PyPI upload

PyPI now supports markdown descriptions. See
https://dustingram.com/articles/2018/03/16/markdown-descriptions-on-pypi

Author: stefankoegl

requirements-dev.txt

@@ -1,2 +1,3 @@
 wheel
-pypandoc==1.4
+twine>=1.11.0
+setuptools>=38.6.0

setup.py

@@ -26,13 +26,10 @@
 # Extract name and e-mail ("Firstname Lastname <mail@example.org>")
 AUTHOR, EMAIL = re.match(r'(.*) <(.*)>', AUTHOR_EMAIL).groups()
 
-try:
-    from pypandoc import convert
-    read_md = lambda f: convert(f, 'rst')
-except ImportError:
-    print('warning: pypandoc module not found, could not convert '
-          'Markdown to RST')
-    read_md = lambda f: open(f, 'r').read()
+
+with open('README.md') as readme:
+	long_description = readme.read()
+
 
 CLASSIFIERS = [
     'Development Status :: 5 - Production/Stable',
@@ -56,7 +53,8 @@
 setup(name=PACKAGE,
       version=VERSION,
       description=DESCRIPTION,
-      long_description=read_md('README.md'),
+      long_description=long_description,
+      long_description_content_type="text/markdown",
       author=AUTHOR,
       author_email=EMAIL,
       license=LICENSE,