Potential bug fixed.

The last 3 trs of the table which contains the submissions is not news submitted by users, so we should remove the last three trs from the rows list.

These are the last three trs in current hacker news html source code:

<tr style="height:5px"></tr>
<tr style="height:10px"></tr>
<tr><td colspan="2"></td><td class="title"><a href="newest?next=8442017&amp;n=31" rel="nofollow">More</a></td></tr>