add push command (#23)
* add push command
* rename push command to upstream and add new optional argument that can override $repository
* Update bin/git-vendor
Co-authored-by: Brett Langdon <me@brett.is>
* Update bin/git-vendor
Co-authored-by: Brett Langdon <me@brett.is>
Co-authored-by: Nissim Bendanan <nbendana@akamai.com>
Co-authored-by: Brett Langdon <me@brett.is>
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