Update version numbers etc for v3.3.1

.VERSION

@@ -1 +1 @@
-3.3.0
+3.3.1

CHANGELOG.md

@@ -3,6 +3,12 @@ Copyright © 2011-20 [James D. Mitchell][] et al.
 
 Licensing information can be found in the `LICENSE` file.
 
+### Version 3.3.1 (released 28/05/2020)
+
+This is a minor release fixing some issues in the build system [Max Horn][]
+related to compatibility with future versions of GAP, and some other minor
+fixes by [James D. Mitchell][] and [Wilf A. Wilson][].
+
 ### Version 3.3.0 (released 28/04/2020)
 
 This is a minor release fixing some issues in the build system 

PackageInfo.g

@@ -9,14 +9,14 @@
 ##
 
 ##  <#GAPDoc Label="PKGVERSIONDATA">
-##  <!ENTITY VERSION "3.3.0">
+##  <!ENTITY VERSION "3.3.1">
 ##  <!ENTITY GAPVERS "4.9.0">
 ##  <!ENTITY DIGRAPHSVERS "1.0.0">
 ##  <!ENTITY ORBVERS "4.8.2">
 ##  <!ENTITY IOVERS "4.5.1">
 ##  <!ENTITY GENSSVERS "1.6.5">
 ##  <!ENTITY IMAGESVERS "1.3.0">
-##  <!ENTITY ARCHIVENAME "semigroups-3.3.0">
+##  <!ENTITY ARCHIVENAME "semigroups-3.3.1">
 ##  <!ENTITY COPYRIGHTYEARS "2011-20">
 ##  <#/GAPDoc>
 
@@ -48,8 +48,8 @@ _STANDREWS := Concatenation(["Mathematical Institute, ",
 SetPackageInfo(rec(
 PackageName := "Semigroups",
 Subtitle := "A package for semigroups and monoids",
-Version := "3.3.0",
-Date := "28/04/2020",  # dd/mm/yyyy format
+Version := "3.3.1",
+Date := "28/05/2020",  # dd/mm/yyyy format
 License := "GPL-3.0-or-later",
 
 ArchiveFormats := ".tar.gz",

VERSIONS

@@ -9,6 +9,7 @@
 ##
 ##
 
+release 3.3.1  - 28/05/2020
 release 3.3.0  - 28/04/2020
 release 3.2.5  - 28/03/2020
 release 3.2.4  - 28/02/2020