Only include chan dependancy with termion backend.

We may want to use channels for all backend some day, but not today.

Cargo.toml

@@ -20,13 +20,16 @@ optional = true
 version = "0.6"
 
 [dependencies]
-chan = "0.1.18"
 num = "0.1"
 odds = "0.2"
 toml = "0.2"
 unicode-segmentation = "1.0"
 unicode-width = "0.1"
 
+[dependencies.chan]
+optional = true
+version = "0.1.18"
+
 [dependencies.chan-signal]
 optional = true
 version = "0.1"
@@ -55,7 +58,7 @@ skeptic = "0.6"
 
 [features]
 default = ["ncurses"]
-termion-backend = ["termion", "chan-signal"]
+termion-backend = ["termion", "chan", "chan-signal"]
 pancurses-backend = ["pancurses"]
 
 [lib]

src/lib.rs

@@ -65,6 +65,7 @@ extern crate unicode_width;
 extern crate odds;
 extern crate num;
 
+#[cfg(feature = "termion")]
 #[macro_use]
 extern crate chan;