func RegisterIssueCommentHandler(name string, fn IssueCommentHandler, help HelpProvider) {
	pluginHelp[name] = help
	issueCommentHandlers[name] = fn
}
func RegisterIssueCommentHandler(name string, fn IssueCommentHandler, help HelpProvider) {
	pluginHelp[name] = help
	issueCommentHandlers[name] = fn
}
// RegisterIssueCommentHandler registers a plugin's github.IssueCommentEvent handler.