Merge #348: Re-export types to reduce breaking changes downstream

eab549c Re-export types to reduce breaking changes downstream (sanket1729)

Pull request description:

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ACKs for top commit:
  elichai:
    ACK eab549c
  apoelstra:
    ACK eab549c

Tree-SHA512: ca3b2c09d68f3401302528779eff4de3204680bd1bbb1795df8e397e562d6e8c10781e083b97c0c3e81c754d70197852e55640976a879b2e8c4584905026736c

src/lib.rs

@@ -168,6 +168,25 @@ pub use context::global::SECP256K1;
 #[cfg(feature = "bitcoin_hashes")]
 use hashes::Hash;
 
+// Backwards compatible changes
+/// Schnorr Sig related methods
+#[deprecated(since = "0.21.0", note = "Use schnorr instead.")]
+pub mod schnorrsig {
+    #[deprecated(since = "0.21.0", note = "Use crate::XOnlyPublicKey instead.")]
+    /// backwards compatible re-export of xonly key
+    pub type PublicKey = super::XOnlyPublicKey;
+    /// backwards compatible re-export of keypair
+    #[deprecated(since = "0.21.0", note = "Use crate::KeyPair instead.")]
+    pub type KeyPair = super::KeyPair;
+    /// backwards compatible re-export of schnorr signatures
+    #[deprecated(since = "0.21.0", note = "Use schnorr::Signature instead.")]
+    pub type Signature = super::schnorr::Signature;
+}
+
+#[deprecated(since = "0.21.0", note = "Use ecdsa::Signature instead.")]
+/// backwards compatible re-export of ecdsa signatures
+pub type Signature = ecdsa::Signature;
+
 /// Trait describing something that promises to be a 32-byte random number; in particular,
 /// it has negligible probability of being zero or overflowing the group order. Such objects
 /// may be converted to `Message`s without any error paths.