Use README.md for package long description

setup.py

@@ -12,14 +12,17 @@
 sys.path.insert(0, path)
 from version import get_git_version
 
+with open('README.md', 'rb') as f:
+    long_descr = f.read().decode('utf-8')
 
 setup(
     name='nllgrid',
     packages=['nllgrid', ],
     include_package_data=True,
     version=get_git_version(),
     description='Python class for reading and writing NonLinLoc grid files',
-    long_description='Python class for reading and writing NonLinLoc grid files',
+    long_description=long_descr,
+    long_description_content_type='text/markdown',
     author='Claudio Satriano',
     author_email='[email protected]',
     url='http://www.ipgp.fr/~satriano',