Resolve props template usage composition api

[xi-osman]

Description of Problem

Was not able to run the provided composition template code snippet and realized its because the props object was not returned.

Proposed Solution

Added the props property and also returned props so the template can reference it.

Additional Information

[NataliaTepluhina]

@xi-osman thank you for the contribution! However, the snippet works without returning props explicitly: https://codesandbox.io/s/setup-with-props-phsye?file=/src/Book.vue

[xi-osman]

@NataliaTepluhina Awesome that worked! Would we want to remove the 'props.' from the template and just leave 'collectionName' then?

<!-- MyBook.vue -->
<template>
  <div>{{ props.collectionName }}: {{ readersNumber }} {{ book.title }}</div>
</template>

[NataliaTepluhina]

@xi-osman yes, that is a mistake I guess 😅 Would you mind doing this change on your pull request?

[xi-osman]

@NataliaTepluhina Sure! already submitted a new commit 😎

[NataliaTepluhina]

Thank you for fixing it!