Update yew-router requirement from 0.17 to 0.18

Updates the requirements on [yew-router](https://github.com/yewstack/yew) to permit the latest version.
- [Release notes](https://github.com/yewstack/yew/releases)
- [Changelog](https://github.com/yewstack/yew/blob/master/CHANGELOG.md)
- [Commits](yewstack/yew@yew-router-v0.17.0...yew-router-v0.18.0)

---
updated-dependencies:
- dependency-name: yew-router
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/helmet-ssr/Cargo.toml

@@ -18,7 +18,7 @@ yew = { version = "0.20" }
 log = "0.4.19"
 console_log = { version = "1.0.0", features = ["color"] }
 wasm-bindgen = "0.2.87"
-yew-router = "0.17"
+yew-router = "0.18"
 gloo = { version = "0.9.0", features = ["futures"] }
 web-sys= "0.3.64"
 bytes = "1.4.0"

examples/helmet-title/Cargo.toml

@@ -12,7 +12,7 @@ yew = { version = "0.20", features = ["csr"] }
 log = "0.4.19"
 console_log = { version = "1.0.0", features = ["color"] }
 wasm-bindgen = "0.2.87"
-yew-router = "0.17"
+yew-router = "0.18"
 gloo = { version = "0.9.0", features = ["futures"] }
 web-sys= "0.3.64"
 

examples/title/Cargo.toml

@@ -12,7 +12,7 @@ yew = { version = "0.20", features = ["csr"] }
 log = "0.4.19"
 console_log = { version = "1.0.0", features = ["color"] }
 wasm-bindgen = "0.2.87"
-yew-router = "0.17"
+yew-router = "0.18"
 gloo = { version = "0.9.0", features = ["futures"] }
 web-sys= "0.3.64"