chore(doc): mention yarn test-all in the CONTRIBUTING.md

CONTRIBUTING.md

@@ -8,7 +8,7 @@ Please note that this project has a [code of conduct](https://github.com/yujiosa
 ## Contributing Process
 
 1. Modify code following [ESLint](https://eslint.org) and the code should be annotated with [JSDoc annotations](https://github.com/Microsoft/TypeScript/wiki/JSDoc-support-in-JavaScript).
-2. Make sure all tests are passed by `yarn test`. Modify tests when the interface has changed.
+2. Make sure all tests are passed by `yarn test` (Or run `yarn test-all` when you modify the [RedisCache](https://github.com/yujiosaka/headless-chrome-crawler/blob/master/cache/redis.js)'s code). Modify tests when the interface has changed.
 2. Update the [README.md](https://github.com/yujiosaka/headless-chrome-crawler/blob/master/README.md) with details of changes to the interface.
 3. Update the [CHANGELOG.md](https://github.com/yujiosaka/headless-chrome-crawler/blob/master/CHANGELOG.md). The versioning scheme we use is [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 4. Make your commit message following [Conventional Commits](https://conventionalcommits.org/).