Read up on MITMproxy. It works best on Mac. For Windows I recommend Kali-Linux virtually so you don't have to build for Ubuntu. If you have problems just email me: morten(at)punnerud.net

They only force HTTPS, not their own sertificate as in Facebook and Snapchat.

Visit mitm.it on your phone (after you have set up a proxy through your pc running MITMproxy) to automatically ad a sertifificate to get it working, or generate your own if you don't trust the service.