Readme: Bump version to 0.12.0 [ci skip]
Readme: Bump version to 0.12.0 [ci skip]

thredded/thredded,jayroh/thredded,thredded/thredded,jayroh/thredded,thredded/thredded,thredded/thredded,jayroh/thredded,jayroh/thredded