If you haven’t already, you should set things up so that you don’t have to keep typing in your password whenever you interact with GitHub via the command line.
You can do this with an “ssh keypair”.
You may have created already created a keypair, if so go to the ssh settings page [https://github.com/settings/ssh] (https://github.com/settings/ssh) on GitHub and upload your public key by copying the content from your computer. (Probably at .ssh/id_rsa.pub)
If you have are unsure or have not previously created a keypair, the instructions for this are on the GitHub website https://help.github.com/articles/generating-ssh-keys.