Bump version to 20.1.0 (#343)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

Cargo.lock

@@ -5,7 +5,7 @@ homepage = "https://github.com/stellar/rs-stellar-xdr"
 repository = "https://github.com/stellar/rs-stellar-xdr"
 authors = ["Stellar Development Foundation <[email protected]>"]
 license = "Apache-2.0"
-version = "20.0.2"
+version = "20.1.0"
 edition = "2021"
 rust-version = "1.74.0"