Update setup.py

Author: ddkohler

setup.py

@@ -63,7 +63,9 @@ def read(fname):
     },
     version=version,
     description="Tools for loading, processing, and plotting multidimensional spectroscopy data.",
+    description_content_type="text/plain",
     long_description=read("README.rst"),
+    long_description_content_type="text/x-rst",
     author="WrightTools Developers",
     license="MIT",
     url="http://wright.tools",