fix(package): Change angular peerDependency semver to match 9.0.0-next/rc (#681)

Author: christopherthielen

package.json

@@ -47,8 +47,8 @@
     }
   },
   "peerDependencies": {
-    "@angular/common": ">=8.0.0",
-    "@angular/core": ">=8.0.0",
+    "@angular/common": "^8.0.0 || ^9.0.0 || ^9.0.0-next",
+    "@angular/core": "^8.0.0 || ^9.0.0 || ^9.0.0-next",
     "@uirouter/core": "^6.0.1",
     "@uirouter/rx": "^0.6.0"
   },