Fix compile error on newer rusts

[euank]

See rust-lang/rust#18937 and related issues
for upstream discussion.

Compiling the previous code on modern rust results in:
error[E0276]: impl has stricter requirements than trait

This is the most trivial way to fix this issue.

A better fix might be possible. If the event loop were to migrate to
tokio and be external to the library (as hyper does these days), that
would allow expressing a more stringent lifetime on the handler.

For now, getting it back to a compiling state seems like a good step.

[gyscos]

It's been over a year, this project might have been abandonned.
Maybe you could publish your fork on crates.io?

[euank]

For what it's worth, I ended up using a combination of the vte library and pty-rs library to solve the problem I had instead of using this. The code I wrote for that is here, though note it is very specific to my exact use-case, so it's not really generically useful.

Since I don't actually use this code anywhere, I don't think I should maintain a fork of it.

[euank]

It's been a couple years. I'll go ahead and close this. It looks like #10 has a more complete update as well regardless.