Bump version to 0.4.28

Author: pitdicker

CITATION.cff

@@ -4,7 +4,7 @@ message: Please cite this crate using these information.
 
 # Version information.
 date-released: 2023-08-29
-version: 0.4.27
+version: 0.4.28
 
 # Project information.
 abstract: Date and time library for Rust

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "chrono"
-version = "0.4.27"
+version = "0.4.28"
 description = "Date and time library for Rust"
 homepage = "https://github.com/chronotope/chrono"
 documentation = "https://docs.rs/chrono/"