Update version numbers etc for 4.0.0

Author: james-d-mitchell

CHANGELOG.md

@@ -3,7 +3,7 @@ Copyright © 2011-2022 [James D. Mitchell][] et al.
 
 Licensing information can be found in the `LICENSE` file.
 
-### Version 4.0.0 (released 27/02/2022)
+### Version 4.0.0 (released 28/02/2022)
 
 This is a major release which simplifies and improves many aspects of the
 package. The kernel module has been simplified signficantly, to make it easier

PackageInfo.g

@@ -37,7 +37,7 @@ SetPackageInfo(rec(
 PackageName := "Semigroups",
 Subtitle := "A package for semigroups and monoids",
 Version := "4.0.0",
-Date := "27/02/2022",  # dd/mm/yyyy format
+Date := "28/02/2022",  # dd/mm/yyyy format
 License := "GPL-3.0-or-later",
 
 ArchiveFormats := ".tar.gz",

VERSIONS

@@ -9,7 +9,7 @@
 ##
 ##
 
-release 4.0.0  - 27/02/2022
+release 4.0.0  - 28/02/2022
 release 3.4.2  - 07/02/2021
 release 3.4.1  - 28/01/2021
 release 3.4.0  - 28/08/2020