This is an important update because it marks the completion of OAUTH calls on the dedicated PostyBirb authentication server. This only applies to DeviantArt, Twitter, and Tumblr. You will need to re-authenticate once re-installing/updating to 0.9.1. This is due to a security flaw found and brought to my attention where my API keys had gotten leaked because I was being stupid. This should hopefully no longer be the case.
It would be best if you went into your allowed applications for Tumblr and Twitter and revoke application access to the old APIs.
Other important things in this patch: Completely reworked how posting works. Feel free to give feedback since I was trying to tackle a lot of complaints and suggestions I have been getting over time and I plan to work more on it into the future.
Your template will also be cleared in an effort to try and fix an issue where templates were getting corrupted when overwritten. I was never able to reproduce the issue, so hopefully this addresses the problems.
E621 will no longer be getting adverts for PostyBirb (unless the user manually puts it there, but you shouldn't since they don't want to see them).
I will soon update the github public repo with the code of 0.9.1.