TIL: you can show diff between multiple commits on github using

github.com/<username>/<repo_name>/compare/<commit1>...<commit2>

eg. https://github.com/dendronhq/handbook/compare/6adc8f73e8abe060541d209daf5005dd730eb456..532f429bfdd9a293f7c1bbca3805c16ef84ea48f