chore: update comment in add-commands (#128)

Author: frederickfogerty

add-commands.js

@@ -1,4 +1,4 @@
 // this file is here so it's easy to register the commands
-// `import 'cypress-testing-library/add-commands'`
+// `import '@testing-library/cypress/add-commands'`
 // eslint-disable-next-line
 require('./dist/add-commands')