message: remove unneeded call to main in plugin example
diff: @@ -137,8 +137,6 @@ fn main() {
  // set up logging by replacing stdout
  initialize(instance.context_mut());
  - let main = instance.func::<(), ()>("_start").unwrap();
  - main.call().expect("Could not initialize");
  // get a reference to the function "plugin_entrypoint" which takes an i32 and returns an i32
  let entry_point = instance.func::<(i32), i32>("plugin_entrypoint").unwrap();
  // call the "entry_point" function in WebAssembly with the number "2" as the i32 argument
  