Remove blockquotes from post previews

Closes flarum/core#144

js/forum/src/components/PostPreview.js

@@ -1,7 +1,6 @@
 import Component from 'flarum/Component';
 import avatar from 'flarum/helpers/avatar';
 import username from 'flarum/helpers/username';
-import humanTime from 'flarum/helpers/humanTime';
 import highlight from 'flarum/helpers/highlight';
 
 /**
@@ -22,8 +21,7 @@ export default class PostPreview extends Component {
       <a className="PostPreview" href={app.route.post(post)} config={m.route} onclick={this.props.onclick}>
         <span className="PostPreview-content">
           {avatar(user)}
-          {username(user)}
-          {humanTime(post.time())}
+          {username(user)}{' '}
           <span className="PostPreview-excerpt">{excerpt}</span>
         </span>
       </a>