change source_url to string

Author: Heliozoa

tmc-langs-cli/src/app.rs

@@ -184,9 +184,9 @@ pub enum Command {
         /// Version control branch.
         #[structopt(long)]
         git_branch: String,
-        /// Version control URL.
+        /// Version control URL or path.
         #[structopt(long)]
-        source_url: Url,
+        source_url: String,
     },
 
     /// Run the tests for the exercise using the appropriate language plugin

tmc-langs-cli/src/lib.rs

@@ -414,7 +414,7 @@ fn run_app(matches: Opt) -> Result<()> {
             let refresh_result = tmc_langs::refresh_course(
                 course_name.clone(),
                 cache_path,
-                source_url.into_string(),
+                source_url,
                 git_branch,
                 cache_root,
             )