Add missing constraints
Add missing constraints

Added missing constraint to the Pythagorean triplet problem that is outlined in the linked Project Euler problem.
exercism/x-common,ErikSchierboom/x-common,rpottsoh/x-common,petertseng/x-common,jmluy/x-common,jmluy/x-common,exercism/x-common,petertseng/x-common,jmluy/x-common,rpottsoh/x-common,ErikSchierboom/x-common