Swap params for consistency

src/routes.rs

 }
 
 #[get("/gists/<id>")]
-pub fn show_gist(connection: DbConn, id: i32) -> Template {
+pub fn show_gist(id: i32, connection: DbConn) -> Template {
     let gist = match gists::get(&connection, id) {
         Ok(gist) => Some(gist),
         Err(_) => None,