Update yahoo.finance.oquote.xml
Fix for broken div id change

Yahoo changed one of the divs during the week of 3/3.  This one line update brings it back into conformity. SigFig is an investment advisor of sorts and the term 'promo' leads one to believe that this odd change to the div may be temporary - if so a reversion to the prior may then be possible.
Merge pull request #421 from doom99/master

Fix yahoo finance oquote table to reflect change in a div class