chore(release): publish

- netlify-cms-app@2.15.68
 - netlify-cms-backend-git-gateway@2.13.1
 - netlify-cms-core@2.54.7
 - netlify-cms-ui-default@2.15.5
 - netlify-cms-widget-code@1.3.4
 - netlify-cms-widget-colorstring@1.1.2
 - netlify-cms@2.10.188

packages/netlify-cms-ui-default/package.json

@@ -1,7 +1,7 @@
 {
   "name": "netlify-cms-ui-default",
   "description": "Default UI components for Netlify CMS.",
-  "version": "2.15.4",
+  "version": "2.15.5",
   "repository": "https://github.com/netlify/netlify-cms/tree/master/packages/netlify-cms-ui-default",
   "bugs": "https://github.com/netlify/netlify-cms/issues",
   "license": "MIT",