Add MiniscriptKey alias to Key

We just renamed the `MinscriptKey` trait to `Key`, add an alias to the
original name. This helps backwards compatibility but also makes the
library more ergonomic since `Key` is so generic it could conflict with
other names in downstream crates.

Author: tcharding

src/lib.rs

@@ -148,6 +148,10 @@ pub use crate::miniscript::satisfy::{Preimage32, Satisfier};
 pub use crate::miniscript::{hash256, Miniscript};
 use crate::prelude::*;
 
+/// Export a type alias to make usage of the library more ergonomic since the
+/// `Key` trait name is so generic that it may cause naming conflicts.
+pub use Key as MiniscriptKey;
+
 ///Public key trait which can be converted to Hash type
 pub trait Key: Clone + Eq + Ord + fmt::Debug + fmt::Display + hash::Hash {
     /// Returns true if the pubkey is uncompressed. Defaults to `false`.