Red: extractor will clear trailing whitespace

references exercism#65

Author: loziniak

test/languages/red_test.rb

@@ -30,10 +30,10 @@ def test_full_example
         CODE
 
         expected = <<~CODE
-          x: 1 
+          x: 1
           y: 11
-          x: 2   
-          x: 3		
+          x: 2
+          x: 3
 
           print "no comments!"