add "wireguard" as a recommended dependency for Debian. (#149)

It's very likely a user will want at least wireguard-dkms, and having
the userspace tools might be useful in an emergency. This metapackage
draws in both.

For automated installations in e.g. containers, use

    apt install --no-install-recommends

to avoid installing recommended packages.

client/Cargo.toml

@@ -44,6 +44,7 @@ assets = [
   ["../doc/innernet.completions.zsh", "usr/share/zsh/site-functions/_innernet", "644"],
 ]
 depends = "libc6, libgcc1, systemd"
+recommends = "wireguard"
 extended-description = "innernet client binary for fetching peer information and conducting admin tasks such as adding a new peer."
 maintainer = "tonari <hey@tonari.no>"
 name = "innernet"

server/Cargo.toml

@@ -59,6 +59,7 @@ assets = [
   ["../doc/innernet-server.completions.fish", "usr/share/fish/vendor_completions.d/innernet-server.fish", "644"],
 ]
 depends = "libc6, libgcc1, libsqlite3-0, zlib1g, systemd"
+recommends = "wireguard"
 maintainer = "tonari <hey@tonari.no>"
 name = "innernet-server"
 priority = "optional"