add vue-router to peer dependencies (#3214)

Author: lobsterkatie

packages/vue/package.json

@@ -24,7 +24,8 @@
     "tslib": "^1.9.3"
   },
   "peerDependencies": {
-    "vue": "2.x"
+    "vue": "2.x",
+    "vue-router": "3.x"
   },
   "devDependencies": {
     "@sentry-internal/eslint-config-sdk": "6.0.3",