Make key module private

We re-export all structs residing in that module. There is no reason
to expose the internal module structure of the library publicly.

Author: thomaseizinger

src/lib.rs

@@ -143,9 +143,10 @@ mod macros;
 #[macro_use]
 mod secret;
 mod context;
+mod key;
+
 pub mod constants;
 pub mod ecdh;
-pub mod key;
 pub mod schnorrsig;
 #[cfg(feature = "recovery")]
 pub mod recovery;
@@ -154,6 +155,7 @@ mod serde_util;
 
 pub use key::SecretKey;
 pub use key::PublicKey;
+pub use key::ONE_KEY;
 pub use context::*;
 use core::marker::PhantomData;
 use core::ops::Deref;

src/secret.rs

@@ -90,7 +90,7 @@ impl SecretKey {
     /// # Example
     ///
     /// ```
-    /// use secp256k1::key::ONE_KEY;
+    /// use secp256k1::ONE_KEY;
     /// let key = ONE_KEY;
     /// // Normal display hides value
     /// assert_eq!(
@@ -123,7 +123,7 @@ impl KeyPair {
     /// # Example
     ///
     /// ```
-    /// use secp256k1::key::ONE_KEY;
+    /// use secp256k1::ONE_KEY;
     /// use secp256k1::schnorrsig::KeyPair;
     /// use secp256k1::Secp256k1;
     ///