Create mark4.py

modified from mark3.py
adding a news headlines collection function to the class stock
webpage format:
https://tw.stock.yahoo.com/q/q?s=1723
regex reference:
 <td height="37" valign="bottom"><a href="/news_content/url/d/a/141024/3/4qw97.html">《外資》賣超股：Sony手機銷售不妙，毅嘉賣超居冠</a></td>