message: Fix `const` -> `static` error
diff: @@ -132,7 +132,7 @@ use requests::{
  };
  /// A resource that will never be available, thus trying to acquire it will wait forever.
  -const UNOBTAINIUM: Lazy<Semaphore> = Lazy::new(|| Semaphore::new(0));
  +static UNOBTAINIUM: Lazy<Semaphore> = Lazy::new(|| Semaphore::new(0));
  /// A pinned, boxed future that produces one or more events.
  pub type Effect<Ev> = BoxFuture<'static, Multiple<Ev>>;
  