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$ git config --global user.name myusername
$ git config --global user.email myemail
$ git config --global github.user myusername
$ git config --global github.token mytoken

#Make sure you are using ssh url for the github repo rather than the https url. 
#It will ask for username and password when you are using https and not SSH. 
#You can check 

1. the file .git/config, or 
2. run git config -e, or 
3. git remote show origin 

#to verify the url and change it if needed.

or to cache it within time period

$ git config --global credential.helper cache
$ git config --global credential.helper "cache --timeout=3600"

or using keychain 
$ git config --global credential.helper osxkeychain # git-credential-winstore.exe(W32)/gnome-keyring (Linux)