docs(github): add tests pass task to PR template

Author: Awk34

PULL_REQUEST_TEMPLATE.md

@@ -1,2 +1,3 @@
 - [ ] I have read the [Contributing Documents](https://github.com/DaftMonk/generator-angular-fullstack/blob/master/contributing.md)
-- [ ] My commit(s) follow the [AngularJS commit message guidelines](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/)
+- [ ] My commit(s) follow the [AngularJS commit message guidelines](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/)
+- [ ] The generator's tests pass (`generator-angular-fullstack$ npm test`)