Update pypi description.

Author: Tim Mitchell

setup.py

@@ -9,7 +9,7 @@
     version=methoddispatch.__version__,
     author=methoddispatch.__author__,
     author_email="[email protected]",
-    description="singledispatch decorator for functions and methods.",
+    description="singledispatch decorator for class methods.",
     license=methoddispatch.__license__,
     keywords="single dispatch decorator method",
     url="https://github.com/seequent/methoddispatch",