Update docs URL to docs.rs

Author: killercup

Cargo.toml

@@ -6,7 +6,7 @@ authors = ["Pascal Hertleif <killercup@gmail.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/killercup/assert_cli.git"
 homepage = "https://github.com/killercup/assert_cli"
-documentation = "http://killercup.github.io/assert_cli/"
+documentation = "http://docs.rs/assert_cli/"
 readme = "README.md"
 categories = ["development-tools::testing"]
 keywords = ["cli", "testing"]