Additions to ISSUE_TEMPLATE (DefinitelyTyped#20735)

.github/ISSUE_TEMPLATE.md

@@ -1,5 +1,9 @@
+If you know how to fix the issue, make a pull request instead.
+
 - [ ] I tried using the `@types/xxxx` package and had problems.
 - [ ] I tried using the latest stable version of tsc. https://www.npmjs.com/package/typescript
 - [ ] I have a question that is inappropriate for [StackOverflow](https://stackoverflow.com/).  (Please ask any appropriate questions there).
 - [ ] [Mention](https://github.com/blog/821-mention-somebody-they-re-notified) the authors (see `Definitions by:` in `index.d.ts`) so they can respond.
   - Authors: @....
+
+If you do not mention the authors the issue will be ignored.