v0.8.4

• Added the ability to supply user-defined functions to filterby and filterby_attr #524 (@nwlandry).
• Reorganized the stats tests #525 (@nwlandry).
• Added a recipe for finding the maximal indices based on statistics #522 (@nwlandry).
• Added the ability to argsort stats #521 (@nwlandry).
• Added recipes for flagged triangular lattices and avg. shortest path length #513 (@thomasrobiglio).
• Add argmax and argmin to the stats interface #518 (@nwlandry).
• Updated the list of projects using XGI #519 (@nwlandry).
• Fixed the multilayer warning (Issue #515) that occurs when specifying colors for each node #517 (@nwlandry).