v0.7

• Added the functionality to load datasets from the BiGG database #384 (@nwlandry).
• Added the draw_dihypergraph() method to draw directed hypergraphs #387 (@thomasrobiglio).
• Changed "an hypergraph" to "a hypergraph" in the docstrings #386 (@acombretrenouard).
• Fixed mathematical expressions that were not represented properly in the docstrings part 2 #382 (@nwlandry).
• Fixed mathematical expressions that were not represented properly in the docstrings #381 (@nwlandry).
• Added the DiHypergraph class, directed view classes, and directed stats classes #372 (@nwlandry).
• Added Katz-centrality algorithm #370 (@acombretrenouard).
• Added the draw_multilayer() drawing function #369 (@thomasrobiglio).
• Fixed members() and memberships() methods so that views are read-only #371 (@nwlandry).
• Added shortest path algorithms #368 (@acombretrenouard).