Switched offline mode implementation to stable cargo.

Author: ibabushkin

Cargo.toml

@@ -27,7 +27,7 @@ name = "rust-semver-public"
 path = "src/bin/rust_semver_public.rs"
 
 [dependencies]
-cargo = { git = "https://github.com/rust-lang/cargo", branch = "master" }
+cargo = "0.37"
 crates-io = "0.24"
 curl = "0.4.21"
 env_logger = "0.6"