draw_chimera matplotlib deprecation warning

[jackraymond]

Description draw_chimera fails with text error: /home/jraymond/PYTHON3-VENV/OCEANSDK/lib/python3.6/site-packages/dwave_networkx-0.8.8-py3.6.egg/dwave_networkx/drawing/qubit_layout.py:195: MatplotlibDeprecationWarning: Adding an axes using the same arguments as a previous axes currently reuses the earlier instance. In a future version, a new instance will always be created and returned. Meanwhile, this warning can be suppressed, and the future behavior ensured, by passing a unique label to each axes instance. ax = fig.add_axes([0.01, 0.01, 0.98, 0.98])

To Reproduce import dwave_networkx as dnx chimera_graph = dnx.chimera_graph(m=4) dnx.draw_chimera(chimera_graph)

Expected behavior Should draw graph and not print error

Environment:

• OS: [Ubuntu 16.04.4 LTS]
• Python version: [e.g. 3.6.9] matplotlib 3.3.2 dwave_networkx 0.8.8

Additional context