Rename utils::rustc module to utils::rustc_version

Author: onur

src/utils/mod.rs

@@ -6,12 +6,12 @@ pub use self::copy::{copy_dir, copy_doc_dir};
 pub use self::github_updater::github_updater;
 pub use self::release_activity_updater::update_release_activity;
 pub use self::daemon::start_daemon;
-pub use self::rustc::{parse_rustc_version, get_current_versions, command_result};
+pub use self::rustc_version::{parse_rustc_version, get_current_versions, command_result};
 
 mod github_updater;
 mod build_doc;
 mod copy;
 mod release_activity_updater;
 mod daemon;
 mod pubsubhubbub;
-mod rustc;
+mod rustc_version;