Add 76 column reference in git cl upload message

tests/git_cl_test.py

Index: tests/git_cl_test.py
diff --git a/tests/git_cl_test.py b/tests/git_cl_test.py
index 52bcb6c96d58177c9c8a6b02771c457e89a24fa6..fc7455cdf56649154d2e99f7a808d254253e7b1f 100755
--- a/tests/git_cl_test.py
+++ b/tests/git_cl_test.py
@@ -385,7 +385,9 @@ class TestGitCl(TestCase):
       self.assertEquals(
           '# Enter a description of the change.\n'
           '# This will be displayed on the codereview site.\n'
-          '# The first line will also be used as the subject of the review.\n' +
+          '# The first line will also be used as the subject of the review.\n'
+          '#----------------------This line is 76 characters long'
+          '----------------------\n' +
           expected_description,
           desc)
       return returned_description