Remove unused code

Closes #467

src/shell/completer.rs

@@ -72,9 +72,4 @@ impl NuCompleter {
 
         Ok((replace_pos, completions))
     }
-
-    // fn update(&self, line: &mut LineBuffer, start: usize, elected: &str) {
-    //     let end = line.pos();
-    //     line.replace(start..end, elected)
-    // }
 }

src/shell/filesystem_shell.rs

@@ -501,11 +501,6 @@ impl Shell for FilesystemShell {
     fn mkdir(
         &self,
         MkdirArgs { rest: directories }: MkdirArgs,
-        // RunnablePerItemContext {
-        //     name,
-        //     shell_manager,
-        //     ..
-        // }: &RunnablePerItemContext,
         name: Span,
         path: &str,
     ) -> Result<OutputStream, ShellError> {