Add peer dependency on router (for testing-library#48)

Author: Jan-Willem Willebrands

projects/testing-library/package.json

@@ -25,6 +25,7 @@
     "@angular/common": "^8.0.0",
     "@angular/platform-browser": "^8.0.0",
     "@angular/animations": "^8.0.0",
+    "@angular/router": "^8.0.0",
     "@angular/core": "^8.0.0"
   },
   "dependencies": {