Adds a comment to the issue.

        :params body: body, content of the comment
        :returns: issue object
        :rtype: :class:`exreporter.stores.github.GithubIssue`

def comment(self, body):
        """Adds a comment to the issue.

        :params body: body, content of the comment
        :returns: issue object
        :rtype: :class:`exreporter.stores.github.GithubIssue`
        """
        self.github_request.comment(issue=self, body=body)

        if self.state == 'closed':
            self.open_issue()
        return self