change: update tests to version 1.1.0

Added missing test version comment using format for current test cases.
Verified test content order and completion. Closes #990

Author: smalley

exercises/change/change_test.py

@@ -2,6 +2,8 @@
 
 from change import find_minimum_coins
 
+# Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0
+
 
 class ChangeTest(unittest.TestCase):
     def test_single_coin_change(self):