Add link to related issue

Author: afontcu

src/vue-testing-library.js

@@ -21,6 +21,7 @@ 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)