lib/Github/Api/Issue/Labels.php
public function deleteLabel($username, $repository, $label)
    {
        return $this->delete('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/labels/'.rawurlencode($label));
    }
public function deleteLabel($username, $repository, $label)
    {
        return $this->delete('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/labels/'.rawurlencode($label));
    }
public function deleteLabel ( $ username , $ repository , $ label ) { return $ this -> delete ( '/repos/' . rawurlencode ( $ username ) . '/' . rawurlencode ( $ repository ) . '/labels/' . rawurlencode ( $ label ) ) ; }
Delete a label for a repository.

@link https://developer.github.com/v3/issues/labels/#remove-a-label-from-an-issue

@param string $username
@param string $repository
@param string $label

@return array
Delete a label for a repository .