Notify broken master on #development

AKA:
- move all conversations to #core
- beating will continue until morale improves
- Learn by pain
- Pain driven development

.gitlab-ci.yml

@@ -377,7 +377,7 @@ notify:slack:
     SETUP_DB: "false"
     USE_BUNDLE_INSTALL: "false"
   script:
-    - ./scripts/notify_slack.sh "#builds" "Build on \`$CI_BUILD_REF_NAME\` failed! Commit \`$(git log -1 --oneline)\` See <https://gitlab.com/gitlab-org/$(basename "$PWD")/commit/"$CI_BUILD_REF"/builds>"
+    - ./scripts/notify_slack.sh "#development" "Build on \`$CI_BUILD_REF_NAME\` failed! Commit \`$(git log -1 --oneline)\` See <https://gitlab.com/gitlab-org/$(basename "$PWD")/commit/"$CI_BUILD_REF"/builds>"
   when: on_failure
   only:
     - master@gitlab-org/gitlab-ce