v0.10.1

• Migrated sphinx theme to pydata
• Improved documentation, code style
• Fixed some flake8 errors
• Exposed some missing classes: DirectedGraph, UndirectedGraph, dotstr_to_html, enrich_kwargs, run_graphviz, make_node_automaton
• pybgl.AssocPropertyMap can now only wrap a defaultdict (not a dict)
• Fixed *_copy, GraphView.*_degree
• Fixed Graphviz-related functions, which now correctly forward the kwargs arguments (e.g. engine=): ipynb_display_graph, graph_to_html, dotstr_to_html, write_graphviz, run_graphviz