imp(Deps): doesnt compile ansi_term on Windows since its not used

Before this commit, ansi_term was compiled anytime the `color` feature
was used. However, on Windows the `color` feature is ignored. Even so
ansi_term was compiled, and just not used. This commit fixes that by
only compiling ansi_term on non-Windows targets. Thanks to @retep998 for
the gudiance.

Closes #1155

Cargo.toml

@@ -53,13 +53,15 @@ unicode-width         = "0.1.4"
 textwrap              = "0.9.0"
 ordermap			  = "0.3.5"
 strsim    = { version = "0.7.0",  optional = true }
-ansi_term = { version = "0.10.0",  optional = true }
 yaml-rust = { version = "0.3.5",  optional = true }
 clippy    = { version = "~0.0.166", optional = true }
 atty      = { version = "0.2.2",  optional = true }
 vec_map   = { version = "0.8", optional = true }
 term_size = { version = "0.3.0", optional = true }
 
+[target.'cfg(not(windows))'.dependencies]
+ansi_term = { version = "0.10.0",  optional = true }
+
 [dev-dependencies]
 regex = "0.2"
 lazy_static = "1"

src/lib.rs

@@ -530,7 +530,7 @@
 #![cfg_attr(feature = "lints", allow(doc_markdown))]
 #![cfg_attr(feature = "lints", allow(explicit_iter_loop))]
 
-#[cfg(feature = "color")]
+#[cfg(all(feature = "color", not(target_os = "windows")))]
 extern crate ansi_term;
 #[cfg(feature = "color")]
 extern crate atty;