Fix socket options for newest elixir-socket package

[edennis]

Here's a fix for issue #6. The problem was that the option handling was sneakily changed in this innocuous "fix warnings" commit to elixir-socket. Now, instead of silently ignoring any unknown options to Socket.connect it barfs when the pattern match fails. The handling of send_timeout was also changed so that now an embedded keyword list is needed. The other thing I noticed is that the deliver: : term option was never passed through to :inet.setopts/2 even in the earlier versions of elixir-socket so I removed it.

Just as a side note: I didn't have a lot of confidence in this library after taking a closer look at the code and the complete absence of tests wasn't very convincing either. It may be worth considering whether or not it's worth cutting the dependency completely and just using gen_tcp directly. Thoughts?

[MaxPower15]

Thanks! Nice catch.

RE: the socket package, I have similar concerns. The main thing it does for us now is tls negotiation, but if we can do that ourselves, depending on fewer packages is a plus. Especially if we're shedding packages without tests.