WIP: Bump version to v0.28.0

If rust-bitcoin#645 merges we will need a release of `secp256k1-sys` as well.

Author: tcharding

CHANGELOG.md

@@ -1,6 +1,9 @@
-# Unreleased
+# 0.28.0 - 2023-08-24
 
-* Bump MSRV to 1.48
+* Depend on recent release of `bitcoin_hashes` v0.13.0 [#621](https://github.com/rust-bitcoin/rust-secp256k1/pull/621)
+* Add a verify function to `PublicKey` [#618](https://github.com/rust-bitcoin/rust-secp256k1/pull/618)
+* Add serialize function for schnorr::Signature [#607](https://github.com/rust-bitcoin/rust-secp256k1/pull/607)
+* Bump MSRV to 1.48 [#595](https://github.com/rust-bitcoin/rust-secp256k1/pull/595)
 * Remove implementations of `PartialEq`, `Eq`, `PartialOrd`, `Ord`, and `Hash` from the
   `impl_array_newtype` macro. Users will now need to derive these traits if they are wanted.
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "secp256k1"
-version = "0.27.0"
+version = "0.28.0"
 authors = [ "Dawid Ciężarkiewicz <[email protected]>",
             "Andrew Poelstra <[email protected]>" ]
 license = "CC0-1.0"