Why does it ask for a username and password from Heroku?

Question

Heroku

When you type git push heroku master it
gives

Username for 'https://git.heroku.com': [email protected]
Password for 'https://[email protected]@git.heroku.com':
remote: !       WARNING:
remote: !       Do not authenticate with username and password using git.
remote: !       Run `heroku login` to update your credentials, then retry the
t command.
remote: !       See documentation for details: https://devcenter.heroku.com/ar
cles/git#http-git-authentication
fatal: Authentication failed for 'https://git.heroku.com/latatalendbot.git/'