They just put up a new patch:
HERO BALANCE UPDATES
Ana
Biotic Rifle
Rate of fire increased by 20%
Magazine size increased from 8 to 10
Developer Comments: While Ana has been very well received, she was showing to be a little bit weaker overall. In addition to helping her feel better to play, these changes should also increase her healing and damage output.
McCree
Peacemaker
Primary Fire
Damage falloff range decreased by 10 meters
Damage falloff amount is unchanged
As a result, even with this change, McCree's effective range is still higher than it was at launch
Alternate Fire
Rate of fire increased by 15%
Flashbang
Recovery time (i.e. the amount of time before McCree can fire again) decreased from 0.5 seconds to 0.35 seconds
Developer Comments: McCree's latest range increase helped him quite a bit, but it was a bit too much in the right hands. This change weakens his long range damage somewhat, but still keeps it stronger than it has been in the recent past. The other changes combine to allow him to land more alternate fire shots on targets that he has hit with Flashbang.
BUG FIXES
Heroes
Targets of Ana's Sleep Dart will no longer instantly recover when damaged (recovery time is now 0.5 seconds)
User Interface
Fixed UI compatibility issues for ATI cards
Fixed a bug that would sometimes cause L?cio, Mei, and other models to only partially render (or disappear)
[PC] Overwatch Patch Notes - July 26, 2016 - Overwatch Forums