feat(assignees): add 6 new options to avoid stale for assignees (#327)

* feat(assignees): add new option to avoid stale for assignees

closes #271

* test: add more coverage

* docs: fix readme format issue

* docs: reorder and enhance typo

* docs(contributing): add more information about the npm scripts

CONTRIBUTING.md

@@ -17,3 +17,29 @@ Run the tests :heavy_check_mark:
 ```bash
 $ npm test
 ```
+
+Run the tests and display only the first failing tests :heavy_check_mark:
+
+```bash
+$ npm test:only-errors
+```
+
+Run the tests with the watch mode :heavy_check_mark:
+
+```bash
+$ npm test:watch
+```
+
+Run the linter and fix (almost) every issue for you :heavy_check_mark:
+
+```bash
+$ npm lint:all:fix
+```
+
+### Before creating a PR
+
+Build, lint, package and test everything.
+
+```bash
+$ npm all
+```