Update nalgebra requirement from 0.18 to 0.19

Updates the requirements on [nalgebra](https://github.com/rustsim/nalgebra) to permit the latest version.
- [Release notes](https://github.com/rustsim/nalgebra/releases)
- [Changelog](https://github.com/rustsim/nalgebra/blob/dev/CHANGELOG.md)
- [Commits](dimforge/nalgebra@v0.18.0...v0.19.0)

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

Cargo.toml

@@ -13,7 +13,7 @@ doctest = false
 
 [dependencies]
 clap = "2.33"
-nalgebra = "0.18"
+nalgebra = "0.19"
 order-stat = "0.1"
 users = "0.9"
 wifiscanner = "0.5"