Host resolution Support

[Melidee]

This PR adds domain name resolution to armada using the standard library (String, u16).to_socket_addrs() function. The README has been updated to show the new behavior. I decided to add the resolution to armada instead of armada_lib because this change was super simple and adding it to armada lib seemed like it would be much more complex and have breaking changes, and any libraries using armada_lib can add resolution themselves somewhat easily.

Also included in this PR is the removal of the deprecated rand::thread_rng().gen_range(), replacing it with the updated rand::random_range() function.

Closes #2

[Melidee]

One known issue with this is the output still displays the IP, not the domain, even if a domain is provided. I will probably go back through and fix this, probably adding ip-only output as an option in case people are chaining armada to tools that don't support host resolution.