v0.3.1

• Refactored the subhypergraph methods
• Moved functions no related to the core Hypergraph data structure to functions.py
• Removed unnecessary duplicated functions (n_bunch_iter, get_edge_data, and has_node)
• Refactored the members() method as well as the NodeView and EdgeView classes for significant speedup.
• Github Actions now tests the docstrings and tutorial notebooks
• The add_edges_from method now supports different input formats.
• Fixed various bugs in the generative models module.
• A method for double edge swaps is now implemented.

Contributors: @leotrs and @nwlandry