repo 1.20

The repo tool is not hosted on Google's servers because of the reason that they have not updated the repo tool for about 2-3 weeks now but the update is already available for users who installed repo without homebrew, updating using the "official" method causes errors while using homebrew.
With repo 1.19 installed every time repo is used the following message appears:

... A new repo command ( 1.20) is available.
... You should upgrade soon:

    cp [REPO_DIR]/.repo/repo/repo /usr/local/bin/repo