Bump router_js from 6.2.2 to 6.2.3

Bumps [router_js](https://github.com/tildeio/router.js) from 6.2.2 to 6.2.3.
- [Release notes](https://github.com/tildeio/router.js/releases)
- [Commits](https://github.com/tildeio/router.js/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>
(cherry picked from commit cdd3145)

package.json

@@ -149,7 +149,7 @@
     "puppeteer": "^1.3.0",
     "qunit": "^2.8.0",
     "route-recognizer": "^0.3.4",
-    "router_js": "^6.2.2",
+    "router_js": "^6.2.3",
     "rsvp": "^4.8.2",
     "semver": "^5.5.0",
     "serve-static": "^1.12.2",

yarn.lock

@@ -8426,10 +8426,10 @@ route-recognizer@^0.3.4:
   resolved "https://registry.yarnpkg.com/route-recognizer/-/route-recognizer-0.3.4.tgz#39ab1ffbce1c59e6d2bdca416f0932611e4f3ca3"
   integrity sha512-2+MhsfPhvauN1O8KaXpXAOfR/fwe8dnUXVM+xw7yt40lJRfPVQxV6yryZm0cgRvAj5fMF/mdRZbL2ptwbs5i2g==
 
-router_js@^6.2.2:
-  version "6.2.2"
-  resolved "https://registry.yarnpkg.com/router_js/-/router_js-6.2.2.tgz#173fe28f004d437a150a42be8220a0341d8df4d8"
-  integrity sha512-gjNl8cxJYHXxLKe/BimTuXLANAb6AVIpK5nK4XvY5d5Do69RMr80YrNFmfHvgD31p0qXUDlz3+fcfAn7ylqIjg==
+router_js@^6.2.3:
+  version "6.2.3"
+  resolved "https://registry.yarnpkg.com/router_js/-/router_js-6.2.3.tgz#9bc2b7c3b01922533ecc70d1478f141e02f610be"
+  integrity sha512-2VmcsRhAZTq8gckbF7EXgQ/klfTiUMmeZk+RPKLie7SmQCiK1TcumiJKdr0GWnRabsSOUdWtmcV72v1WVXUSDQ==
   dependencies:
     "@types/node" "^10.5.5"