Heal/Rally fixed

Hi, 

i fixed the bug of heal/rally:

Bug reason: Perform skill does not allow to access the source of a skill. So enhance value has been added only if card has the enhance skill. That is only the case when the card has the skill.

Solution: applied the ugly solution of strike: value is raised outside of the perform skill function.

Readme.MD has an example of debug output that shows rally to work. Heal should work too, but i have not tested it.

Please check!