Tweaked a mkrelease message text.

 - Legacy-Id: 11451

Author: levkowetz

bin/mkrelease

@@ -188,7 +188,7 @@ note "Upgrading the python library modules before checking migrations and runnin
 pip freeze > minimum-requirements.txt
 pip install --upgrade -r requirements.txt
 
-note "Checking that we don't have any model changes that haven't been captured in migrations ..."
+note "Checking that all model changes have been captured in migrations ..."
 ietf/manage.py makemigrations | tee /dev/stderr | grep -q "^No changes detected$" || die "Model changes without migrations found."
 
 note "Running the tests suite and writing release coverage data ..."