docs(README): Note minimum python version

Author: tony

README.md

@@ -62,7 +62,7 @@ See donation options at <https://www.git-pull.com/support.html>.
 
 ## More information
 
-- Python support: Python 2.7, >= 3.4, pypy
+- Python support: 3.9+, pypy
 - VCS supported: git(1), svn(1), hg(1)
 - Source: <https://github.com/vcs-python/libvcs>
 - Docs: <https://libvcs.git-pull.com>