MAINT: long_description setup parameter should come from long_description.rst

Author: effigies

setup.cfg

@@ -21,7 +21,7 @@ classifiers =
     Topic :: Scientific/Engineering
 license = MIT License
 description = Access a multitude of neuroimaging data formats
-long_description = file:README.rst
+long_description = file:long_description.rst
 long_description_content_type = text/x-rst; charset=UTF-8
 platforms = OS Independent
 provides =