Updated README

Author: ijlee2

README.md

@@ -2,12 +2,12 @@
 
 This codemod will co-locate component JS and HBS as described in the [Component Templates Co-location RFC](https://emberjs.github.io/rfcs/0481-component-templates-co-location.html).
 
-### Examples
+## Examples
 
  * [Travis CI](https://github.com/GavinJoyce/travis-web/pull/1)
  * [Ghost Admin](https://github.com/GavinJoyce/Ghost-Admin/pull/1)
 
-### Usage
+## Usage
 
 To run the migrator on your app:
 
@@ -16,6 +16,8 @@ cd your/project/path
 npx github:ember-codemods/ember-component-template-colocation-migrator
 ```
 
+### Flat component structure
+
 By default, the migrator changes the **classic** component structure to the **flat** component structure.
 
 ```
@@ -30,6 +32,8 @@ your-project-name
 │   ...
 ```
 
+### Nested component structure
+
 If you want to change from **classic** to **nested**, you can add the `-ns` flag:
 
 ```sh
@@ -53,6 +57,12 @@ your-project-name
 ```
 
 
-### Running Tests
+## Running Tests
+
+The tests were inspired by [ember-module-migrator](https://github.com/ember-codemods/ember-module-migrator/blob/master/test/engines/classic-test.js).
 
- * `npm run test`
+If you are contributing to this codemod, please check that all tests pass by running,
+
+```sh
+yarn test
+```