v0.5.2

• Added the find_triangles() and flag_complex_d2() functions. The flag_complex_d2() function is much faster than flag_complex() for simplicial complexes of max order 2. Also refactored random_flag_complex_d2() to use flag_complex_d2() #263 (@maximelucas).
• Added the items() method so NodeStats and EdgeStats are even more dict-like #233 (@leotrs).
• Added the ability to cache the output of load_xgi_data() and added more interpretable errors when the http request fails #261 (@nwlandry).
• Deleted the data folder #260 (@nwlandry).
• Split the simulation of the Kuramoto model and its order parameter into two functions #257 (@maximelucas).
• Added the ability to write/read xgi-data datasets to/from a file, and pointed the load_xgi_data() function to the new xgi-data collection in Gitlab #254 (@acuschwarze).
• remove singletons from random generators #256 (@maximelucas).
• Remove references to the disGene dataset in the data folder #253 (@nwlandry).
• Updated the new release process #249 (@nwlandry).