docs: update contribution guide (#1527)

AllanZhengYP · web-flow · commit 0ff9798098fb · 2020-09-21T09:43:20.000-07:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -93,7 +93,7 @@ yarn
 To run all of the tests in the repository, still from the root package, run the following command:
 
 ```
-yarn test-all
+yarn test:all
 ```
 
 The above command will use Lerna to run the `test` script in every package in the `packages` directory.
