Add Composer branch-alias
Add Composer branch-alias

This allows installations to require version 0.1.0 with minimum-stability=dev, and they will get the latest from master.

See flarum/core#727

pladask/flarum-ext-norwegian-bokmal,raweba/flarum-ext-danish,gtugablue/flarum-ext-portuguese,pladask/flarum-ext-norwegian-nynorsk,flarum/english,flarum/flarum-ext-english,FlarumChina/flarum-ext-simplified-chinese-pro,pladask/flarum-ext-norwegian-bokmal,ogioncz/flarum-ext-czech,pladask/flarum-ext-norwegian-nynorsk,FlarumChina/flarum-ext-simplified-chinese-pro,ogioncz/flarum-ext-czech,balkanje/flarum-ext-bosnian1