docs: Fix URL path to github hosted files

Closes clap-rs#1106

Cargo.toml

@@ -4,7 +4,7 @@ name = "clap"
 version = "2.27.1"
 authors = ["Kevin K. <kbknapp@gmail.com>"]
 exclude = ["examples/*", "clap-test/*", "tests/*", "benches/*", "*.png", "clap-perf/*", "*.dot"]
-repository = "https://github.com/kbknapp/clap-rs.git"
+repository = "https://github.com/kbknapp/clap-rs"
 documentation = "https://docs.rs/clap/"
 homepage = "https://clap.rs/"
 readme = "README.md"