Edit in JSFiddle

const ENDPOINT = 'https://api.github.com/orgs/codecasts/repos';

new Vue({
  el: '#app',
  data: {
    repos: [],
  },
  mounted() {
  	axios.get(ENDPOINT)
    	.then(response => response.data)
      .then(data => Vue.set(this, 'repos', data));
  }
});
<div class="container" id="app">
  <header class="page-header">
    <h1>Codecasts Repos</h1>
  </header>
  <ul class="list-group">
    <li v-for="repo in repos" class="list-group-item" :title="repo.description">
      <span class="badge"> {{ repo.stargazers_count }} <i class="fa fa-star-o"></i></span>
      <a :href="repo.url">
        {{ repo.name }} 
      </a>
    </li>
  </ul>

</div>