[Feedback Thread Continued Part III] Mercy Updates - Jan 30, 2018

[BlitzSpeed-1183]

@Cheat2Win-11242

Pick rate climbing too high. Maybe nerf her healing back down to 50 per second, can still be 60 in Valk. Also increase GA cooldown by 1 second.

ht tps://www.youtube.com/watch?v=YersIyzsOpc

ht tps://www.youtube.com/watch?v=iXHwEwPJcEQ