message: Plugin must be sendable
diff: @@ -44,6 +44,10 @@ pub struct Plugin {
  process: Popen,
  }
  +/// Plugin can always be sent between threads
  +/// It contains only a handle to subprocess.
  +unsafe impl Send for Plugin {}
  +
  impl Plugin {
  /// Get address of the plugin
  pub fn addr(&self) -> &ServerAddr {
  