Update CONTRIBUTING.md

EasonTao · Mar 19, 2019 · 00a165b · 00a165b
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diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
@@ -37,6 +37,7 @@ Commit messages should follow the [commit message convention](./COMMIT_CONVENTIO
 * We use [yarn](https://yarnpkg.com/lang/en/) for package management.
 * Be proactive. If you think something is wrong - create an issue or discuss.
 * Recommended tools: [GitKraken](https://www.gitkraken.com/), [WebStorm](https://www.jetbrains.com/webstorm/)
+* If you work on UI components - work in book environment (`yarn serve:book`). We want to keep global stuff out of components.
 
 #### Before release workflow
 * Update package versions to newest ones. Update lock files (for both `npm` and `yarn`)