acronym: Remove test with mixed-case word

see: https://github.com/exercism/x-common/pull/788

exercises/acronym/acronym_test.py

@@ -3,7 +3,7 @@ import unittest
 from acronym import abbreviate
 
 
-# test cases adapted from `x-common//canonical-data.json` @ version: 1.0.0
+# test cases adapted from `x-common//canonical-data.json` @ version: 1.1.0
 
 class AcronymTest(unittest.TestCase):
     def test_basic(self):
@@ -12,9 +12,6 @@ class AcronymTest(unittest.TestCase):
     def test_lowercase_words(self):
         self.assertEqual(abbreviate('Ruby on Rails'), 'ROR')
 
-    def test_camelcase(self):
-        self.assertEqual(abbreviate('HyperText Markup Language'), 'HTML')
-
     def test_punctuation(self):
         self.assertEqual(abbreviate('First In, First Out'), 'FIFO')