fix syntax error name can not include :

Author: rouilj

.github/workflows/ci-test.yml

@@ -96,7 +96,7 @@ jobs:
           python setup.py install
           (cd locale; make local_install; ls -lR locale/de/LC_MESSAGES)
 
-      - name: run flake8: abort for syntax error, otherwise warn only
+      - name: run flake8 - abort for syntax error, otherwise warn only
         run: |
             # stop the build for Python syntax errors or undefined names
             flake8 roundup --count --select=E9,F63,F7,F82 --show-source --statistics