feat(core): Switch to @uirouter/core npm module

Author: christopherthielen

package.json

@@ -1,7 +1,7 @@
 {
-  "name": "ui-router-core",
+  "name": "@router/core",
   "description": "UI-Router Core: Framework agnostic, State-based routing for JavaScript Single Page Apps",
-  "version": "5.0.0-pre.1",
+  "version": "5.0.0",
   "scripts": {
     "clean": "shx rm -rf lib lib-esm",
     "build": "npm run clean && tsc && tsc -m es6 --outDir lib-esm && npm run fixdts",