Remove a trailing comma which may insert null element

The behavior occurs in Active Scripting engine on WSF.
It was enbugged by 487e10791253a8606e8a600ee75bb0359f15c4d5.
Unfortunately, Our test does not detect the problem because language processors for tests ignore a trailing comma.
Correct an image source for a Code Climate GPA badge.

It was a sample URI!
Merge branch 'issue/14'