Bump tinymce from 4.9.7 to 5.9.0

Bumps [tinymce](https://github.com/tinymce/tinymce/tree/HEAD/modules/tinymce) from 4.9.7 to 5.9.0.
- [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/5.9.0/modules/tinymce)

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

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -24,7 +24,7 @@
     "angular-ui-tinymce": "0.0.19",
     "ng-csv": "0.3.6",
     "ng-table": "3.0.1",
-    "tinymce": "4.9.7",
+    "tinymce": "5.9.0",
     "@wvr/core": "2.0.7"
   },
   "devDependencies": {