Use crate::prelude::* to load Vec, rather than crate::Vec

This is kinda dumb, but the bindings get confused when referring
to `Vec` absolutely in a `use` statement, and there's no reason not
to load our prelude everywhere.

Author: TheBlueMatt

lightning-invoice/src/payment.rs

@@ -9,7 +9,8 @@
 
 //! Convenient utilities for paying Lightning invoices.
 
-use crate::{Bolt11Invoice, Vec};
+use crate::Bolt11Invoice;
+use crate::prelude::*;
 
 use bitcoin_hashes::Hash;