bump version to 0.21.3

Author: apoelstra

CHANGELOG.md

@@ -1,3 +1,10 @@
+# 0.21.3 - 2022-01-31
+
+* Several documentation improvements ([#366](https://github.com/rust-bitcoin/rust-secp256k1/pull/366), [#365](https://github.com/rust-bitcoin/rust-secp256k1/pull/365), [#373](https://github.com/rust-bitcoin/rust-secp256k1/pull/373), [#381](https://github.com/rust-bitcoin/rust-secp256k1/pull/381), [#369](https://github.com/rust-bitcoin/rust-secp256k1/pull/369))
+* Deprecate the [`generate_schnorrsig_keypair` method](https://github.com/rust-bitcoin/rust-secp256k1/pull/372) (unclear value)
+* Add [serde traits to `KeyPair`](https://github.com/rust-bitcoin/rust-secp256k1/pull/379)
+* Redo the [API of the new `Parity` type](https://github.com/rust-bitcoin/rust-secp256k1/pull/382) to more clearly match our desired semantics; **the `From<i32>` impl on this type is now deprecated**.
+
 # 0.21.0 - 2022-01-02
 
 * Fix `KeyPair::from_seckey_slice` [error return value](https://github.com/rust-bitcoin/rust-secp256k1/pull/316)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "secp256k1"
-version = "0.21.2"
+version = "0.21.3"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"