build: make @vue/shared public

This avoids it being inlined multiple times in esm bundler builds

packages/reactivity/package.json

@@ -13,7 +13,7 @@
   "sideEffects": false,
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/vuejs/vue.git"
+    "url": "git+https://github.com/vuejs/vue-next.git"
   },
   "buildOptions": {
     "name": "VueReactivity",
@@ -30,7 +30,10 @@
   "author": "Evan You",
   "license": "MIT",
   "bugs": {
-    "url": "https://github.com/vuejs/vue/issues"
+    "url": "https://github.com/vuejs/vue-next/issues"
   },
-  "homepage": "https://github.com/vuejs/vue/tree/dev/packages/reactivity#readme"
+  "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/reactivity#readme",
+  "dependencies": {
+    "@vue/shared": "3.0.0-alpha.7"
+  }
 }