Remove outdated comment

Author: afontcu

src/vue-testing-library.js

@@ -21,8 +21,6 @@ function render(
   } = {},
   configurationCb,
 ) {
-  // TODO: Can we simplify this by using attachTo?
-  // Related: https://github.com/vuejs/vue-test-utils-next/issues/10
   const div = document.createElement('div')
   const baseElement = customBaseElement || customContainer || document.body
   const container = customContainer || baseElement.appendChild(div)