Use evented I/O for the pty

This was largely an experiment to see whether writing and reading from a
separate thread was causing terminal state corruption as described in
https://github.com/jwilm/alacritty/issues/9. Although this doesn't seem
to fix that particular issue.

Keeping this because it generally seems more correct than
reading/writing from separate locations.

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index a8067ccb..56a5b71b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,6 +18,7 @@ serde = "0.8"
 serde_yaml = "0.4"
 serde_macros = "0.8"
 vte = "0.1.2"
+mio = "0.6"
 
 [build-dependencies]
 gl_generator = "0.5"