v0.9.2

• Added nonuniform centralities and fixed the node_edge_centrality method #600 (@nwlandry).
• Fixed Issue #615. Added a docstring to the watts_strogatz_hypergraph method #618 (@nwlandry).
• Made the HOW_TO_CONTRIBUTE guide more friendly to new contributors and accurate to our current release process #614 (@nwlandry).
• Fixed the local_clustering_coefficient method #608 (@cosimoagostinelli).
• Created an initial sphinx-gallery #609 (@maximelucas).
• Changed aggregate stats type from numpy ints and floats to Python ints and floats and added unique method. #603 (@nwlandry).