Allow clap features to be activated independently (#100)

CHANGELOG.md

@@ -5,6 +5,8 @@
   short-circuiting flags. ([#98](https://github.com/TeXitoi/structopt/pull/98)
   by [@quodlibetor](https://github.com/quodlibetor))
 
+* Allow users to enable `clap` features independently.
+
 # v0.2.7 (2018-04-12)
 
 * Add flattening, the insertion of options of another StructOpt struct into another ([#92](https://github.com/TeXitoi/structopt/pull/92)) by [@birkenfeld](https://github.com/birkenfeld)

Cargo.toml

@@ -13,6 +13,14 @@ readme = "README.md"
 [features]
 default = ["clap/default"]
 nightly = ["structopt-derive/nightly"]
+suggestions = ["clap/suggestions"]
+color = ["clap/color"]
+wrap_help = ["clap/wrap_help"]
+yaml = ["clap/yaml"]
+lints = ["clap/lints"]
+debug = ["clap/debug"]
+no_cargo = ["clap/no_cargo"]
+doc = ["clap/doc"]
 
 [badges]
 travis-ci = { repository = "TeXitoi/structopt" }