Release a new version

def release():
    """Release a new version"""
    release_check()
    build()
    print("Releasing %s version %s." % (env.projname, env.version))
    local("git tag %s" % env.version)
    local('gpg --detach-sign --armor dist/coursera-*.tar.gz*')
    local('twine upload dist/coursera-*.tar.gz*')
    local("git push")
    local("git push --tags")