Fixed compilation errors and updated dependencies

[manpat]

Hey I don't know if you're still actively maintaining this project but I had to make a few changes to get it building on my system and I figured I might as well submit a PR

The version from cargo.io fails to locate clang on my system because of how the version of clang-sys used found clang. In essence, on OSes without a standard 'exe' extension it will match directories named 'clang' as well as binaries - the version I've updated it to has checks to avoid this.

Also there's two hard compilation errors in client.rs which I assume were just uncaught copy-paste errors or something. Simple fix but again, the version on cargo.io doesn't compile without it

[vvanders]

No, this is largely unmaintained and actually pretty out of date. The latest version was in the forked(networkprotocol/netcode.io) library but was since removed since I didn't have time to maintain it.

You're totally welcome to fork it if you want since I probably won't have time to properly review PRs.

[manpat]

yeah I noticed it was a bit out of date haha

I've fixed a few more bugs and merged it back with the original project over here
https://github.com/Game-Insight/netcode.io/tree/master

I can't see myself picking up the maintenance effort, just leaving this here for future reference :p