Merge pull request #738 from brson/clap

Update clap. Fixes #657

Author: alexcrichton

Cargo.lock

@@ -36,7 +36,7 @@ rustup-dist = { path = "src/rustup-dist", version = "0.6.3" }
 rustup-utils = { path = "src/rustup-utils", version = "0.6.3" }
 download = { path = "src/download" }
 error-chain = "0.5.0"
-clap = "2.2.4"
+clap = "2.11.3"
 regex = "0.1.41"
 url = "1.1.0"
 term = "0.4.4"