Bump vue from 2.5.20 to 2.5.21

Bumps [vue](https://github.com/vuejs/vue) from 2.5.20 to 2.5.21.
- [Release notes](https://github.com/vuejs/vue/releases)
- [Commits](https://github.com/vuejs/vue/compare/v2.5.20...v2.5.21)

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

package-lock.json

@@ -11719,9 +11719,9 @@
 			}
 		},
 		"vue": {
-			"version": "2.5.20",
-			"resolved": "https://registry.npmjs.org/vue/-/vue-2.5.20.tgz",
-			"integrity": "sha512-kVLZi8RWOk8qwAt+a0bVDy9VV5Zzcnj0fLCMyKLx1dmEBjqmYJYRWHvPwiypiJBtJkdmROy5NP5hyDqTdfBcvQ=="
+			"version": "2.5.21",
+			"resolved": "https://registry.npmjs.org/vue/-/vue-2.5.21.tgz",
+			"integrity": "sha512-Aejvyyfhn0zjVeLvXd70h4hrE4zZDx1wfZqia6ekkobLmUZ+vNFQer53B4fu0EjWBSiqApxPejzkO1Znt3joxQ=="
 		},
 		"vue-click-outside": {
 			"version": "1.0.7",

package.json

@@ -35,7 +35,7 @@
 		"twemoji": "^11.2.0",
 		"uuid": "^3.3.2",
 		"v-tooltip": "^2.0.0-rc.33",
-		"vue": "^2.5.20",
+		"vue": "^2.5.21",
 		"vue-click-outside": "^1.0.7",
 		"vue-contenteditable-directive": "^1.2.0",
 		"vue-emoji-picker": "^1.0.1",