Log Message:
py-graphviz: updated to 0.11

Version 0.11

Add quiet argument to .render() and .pipe() methods of Graph,
Digraph, and Source objects, allowing to suppress stderr of the
layout subprocess (parity with stand-alone render() and pipe()
functions).

The rendering process for render() methods and stand-alone function is now
started from the directory of the renderred dot source file. This allows to
render graph descriptions that use relative paths inline (e.g. for referring to
image files to be included) by using paths relative to the source file
location. Previously, such relative paths would need to be given relative to
the directory from which render() was  started, so this change is backwards
incompatible for code that relied on the previous behaviour.

Drop Python 3.4 support.