tests: add a comment that the pygments import is still necessary.

(imported from commit c17dfc9e3b8ecf207b4cb7f4d33443122b747905)

zephyr/tests.py

@@ -33,6 +33,8 @@ try:
 except:
     bail('Test suite only runs correctly with --settings=humbug.test_settings')
 
+# Even though we don't use pygments directly in this file, we need
+# this import.
 try:
     import pygments
 except ImportError: