Push homebrew updates to registry on release
For each release, we should push homebrew package updates automatically through Travis CI.
See: https://github.com/timvisee/ffsend/issues/21#issuecomment-472966583
For each release, we should push homebrew package updates automatically through Travis CI.
See: https://github.com/timvisee/ffsend/issues/21#issuecomment-472966583