Log Message:
Update to 1.11
Update DEPENDS
Based on PR/51271 from kamelderouiche@yahoo.com

Upstream changes:
1.11

API changes

    [#1930] No longer import nx_agraph and nx_pydot into the top-level \ 
namespace. They can be accessed within networkx as e.g. nx.nx_agraph.write_dot \ 
or imported as from networkx.drawing.nx_agraph import write_dot.
    [#1750] Arguments center and scale are now available for all layout \ 
functions. The defaul values revert to the v1.9 values (center is the origin for \ 
circular layouts and domain is [0, scale) for others.
    [#1924] Replace pydot with pydotplus for drawing with the pydot interface.
    [#1888] Replace support for Python3.2 with support for Python 3.5.

Miscellaneous changes

    [#1763] Set up appveyor to automatically test installation on Windows \ 
machines. Remove symbolic links in examples to help such istallation.

Change many doc_string typos to allow sphinx to build the docs without errors or \ 
warnings.

Enable the docs to be automatically built on readthedocs.org by changing \ 
requirements.txt