Remove ansi_term dependency for clap

The [clap](https://crates.io/crates/clap) crate used for argument
parsing uses the `ansi_term` crate for colorized output, but colorized
output is disabled for Windows. However, `ansi_term` is still compiled
and used on Windows unless the build is configured to disable the
"color" feature as discussed here:
clap-rs/clap#1155 (comment)

The manifest is updated to disable the color feature following these
instructions:
https://github.com/kbknapp/clap-rs#optional-dependencies--features

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "cargo-wix"
 description = "Build Windows installers using the Wix Toolset"
-version = "0.0.3"
+version = "0.0.4"
 authors = ["Christopher Field <cfield2@gmail.com>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/volks73/cargo-wix"
@@ -20,7 +20,6 @@ name = "cargo_wix"
 
 [dependencies]
 chrono = "0.4"
-clap = "2.30"
 env_logger = "0.5.7"
 log = "0.4"
 mustache = "0.9"
@@ -29,3 +28,8 @@ termcolor = "0.3.6"
 toml = "0.4"
 uuid = { version = "0.5", features = ["v4"] }
 
+[dependencies.clap]
+version = "2.31"
+default-features = false
+features = ["suggestions", "vec_map"]
+