Bump tinymce from 4.9.11 to 5.10.0

Bumps [tinymce](https://github.com/tinymce/tinymce/tree/HEAD/modules/tinymce) from 4.9.11 to 5.10.0.
- [Release notes](https://github.com/tinymce/tinymce/releases)
- [Changelog](https://github.com/tinymce/tinymce/blob/develop/modules/tinymce/CHANGELOG.md)
- [Commits](https://github.com/tinymce/tinymce/commits/5.10.0/modules/tinymce)

---
updated-dependencies:
- dependency-name: tinymce
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "pace-js": "~1.0.2",
     "promise-polyfill": "^8.1.3",
     "shortid": "^2.2.8",
-    "tinymce": "^4.9.11"
+    "tinymce": "^5.10.0"
   },
   "devDependencies": {
     "angular-mocks": "~1.4.4",