Update readme to point to ember-codemods/ember-component-template-colocation-migrator (#6)

* Update readme to point to `ember-codemods/ember-component-template-colocation-migrator`

* Update README.md

Author: GavinJoyce

README.md

@@ -13,9 +13,9 @@ To run the migrator on your app:
 
 ```sh
 cd your/project/path
-npx github:gavinjoyce/ember-component-template-colocation-migrator
+npx github:ember-codemods/ember-component-template-colocation-migrator
 ```
 
 ### Running Tests
 
- * `npm run test`
+ * `npm run test`