CI error fixes (#366)

Fixed identity conversion
Fixed clippy warning
Fixed tokio example compilation
mio upgrade

Cargo.toml

@@ -53,15 +53,15 @@ crossterm_winapi = "0.5.1"
 # UNIX dependencies
 #
 [target.'cfg(unix)'.dependencies]
-libc = "0.2.51"
-mio = "0.6.19"
+libc = "0.2"
+mio = "0.6.21"
 signal-hook = { version = "0.1.12", features = ["mio-support"] }
 
 #
 # Dev dependencies (examples, ...)
 #
 [dev-dependencies]
-tokio = { version = "0.2.1", features = ["macros"] }
+tokio = { version = "0.2.9", features = ["full"] }
 futures = "0.3"
 futures-timer = "2"
 async-std = "1"

src/terminal/sys/unix.rs

@@ -24,7 +24,7 @@ pub(crate) fn exit() {
     ::std::process::exit(0);
 }
 
-#[allow(identity_conversion)]
+#[allow(clippy::identity_conversion)]
 pub(crate) fn size() -> Result<(u16, u16)> {
     // http://rosettacode.org/wiki/Terminal_control/Dimensions#Library:_BSD_libc
     let mut size = winsize {