Revert "Remove ansi_term dependency"

Broke colors
https://github.com/denoland/deno/issues/4112#issuecomment-590545385

This reverts commit c250778704.

cli/lib.rs

@@ -388,6 +388,9 @@ async fn test_command(
 }
 
 pub fn main() {
+  #[cfg(windows)]
+  ansi_term::enable_ansi_support().ok(); // For Windows 10
+
   log::set_logger(&LOGGER).unwrap();
   let args: Vec<String> = env::args().collect();
   let flags = flags::flags_from_vec(args);