[REGRESSION] Revert flake8.ini filename (- WIP PR #76 -)

Author: reactive-firewall

.flake8 renamed to .flake8.ini

@@ -103,7 +103,7 @@ test-pytest: cleanup test-reports
 	$(QUIET)$(ECHO) "$@: Done."
 
 test-style: cleanup
-	$(QUIET)flake8 --ignore=W191,W391 --max-line-length=100 --verbose --count --config=.flake8
+	$(QUIET)$(PYTHON) -m flake8 --ignore=W191,W391 --max-line-length=100 --verbose --count --config=.flake8.ini --show-source || DO_FAIL="exit 2" ;
 	$(QUIET)tests/check_spelling 2>/dev/null || true
 	$(QUIET)$(ECHO) "$@: Done."