readd allow_failure

.gitlab/ci/lint.gitlab-ci.yml

@@ -7,6 +7,7 @@ lint37:
   stage: lint
   image: "before-install"
   needs: []
+  allow_failure: true
   script:
     - tox -e py37-lint
 
@@ -20,6 +21,7 @@ invalidcode37:
 format-check:
   stage: lint
   image: "before-install"
+  allow_failure: true
   needs: []
   script:
     - tox -e py37-black-check