Dawid Dziurla f90612ccf0
bump-formula-pr: make it usable on linux
This commit makes it possible to use `bump-formula-pr` on linux to
contribute to `homebrew-core` as easily as it is on macOS, but with some
additional steps made before actual bumping of the formula.

Differences in the process (before bumping):
- add `homebrew-core` remote named `homebrew`
- fetch `homebrew/master`
- check if formula exists in `homebrew-core`
- switch to `homebrew/master` ref
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