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Fixes #8
Update version to 1.0.3
Add Homebrew upgrade command

Because I always get mixed up between `brew update` (to update Brew itself) and `brew upgrade` (to upgrade a given package).
Merge pull request #9 from hugovk/patch-1

Add Homebrew upgrade command
Merge branch 'master' of github.com:simonwhitaker/gibo
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README.md