Remove unused lifetime

src/routes.rs

@@ -46,7 +46,7 @@ pub fn show_snippet(id: i32, connection: DbConn) -> Template {
 }
 
 #[post("/api/snippets", format = "application/json", data = "<snippet>")]
-pub fn create_snippet<'a>(
+pub fn create_snippet(
     snippet: Json<InsertableSnippet>,
     connection: DbConn,
 ) -> Result<status::Created<Json<Snippet>>, Status> {