CONTRIBUTING.rst - There is no develop branch anymore

Author: techtonik

CONTRIBUTING.rst

@@ -10,9 +10,8 @@ Contributor notes
   Use Python 3 print-function syntax, and always ``use sys.exc_info()[1]``
   inside the ``except`` block to get at exception objects.
 
-* virtualenv uses git-flow_ to `coordinate development`_. The latest stable
-  version should exist on the *master* branch, and new work should be
-  integrated to *develop*.
+* Pull requests should be made against `master` branch, which is also our
+  latest stable version.
 
 * All changes to files inside virtualenv_embedded should be integrated to
   ``virtualenv.py`` with ``bin/rebuild-script.py``.