docs(README): move to .rst extension

MANIFEST.in

@@ -3,3 +3,4 @@ include */*.py
 recursive-include data *.gif *.png *.ico *.css *.js
 recursive-include i18n *.po
 recursive-include wdoc *
+include README.rst

setup.py

@@ -43,8 +43,8 @@ from distutils.command import install_data
 from __pkginfo__ import modname, version, license, description, web, \
      author, author_email
 
-if exists('README'):
-    long_description = file('README').read()
+if exists('README.rst'):
+    long_description = file('README.rst').read()
 else:
     long_description = ''