CIC wants a confirmation of your income from September 30, 2012, to September 30, 2013. This is before you got divorced. So send in the confirmation of your income. Include your ex-wife's income (if you need it for the LICO requirements, which I presume you do). Then state you and your wife got divorced on November 21, 2013, so after that date only your income is counting for LICO, and your ex-wife is no longer a cosigner. Then see what happens.
If CIC accepts this, and you have sufficient income afterwards, great. If CIC does not accept this, then no visa will be issued. If you do not send in the info, then the visa will be refused. If you do not tell CIC you got divorced, they will find out, and the visa will be refused.
The point is, CIC asked you to send them information. If you do not, they will not issue the visa. So you might as well try. Do not lie, though, because misrepresentation causes more problems. As the previous poster noted, you have to inform CIC that your marital status has changed.