Update version numbers etc for v1.3.1

.VERSION

@@ -1 +1 @@
-1.3.0
+1.3.1

CHANGELOG.md

@@ -4,6 +4,12 @@ Torpey, Wilf A. Wilson et al.
 
 Licensing information can be found in the `LICENSE` file.
 
+## Version 1.3.1 (released 27/11/2020)
+
+This is a minor release fixing some issues, some performance improvements, and
+removing some deprecated code.  The changes in this release were made by [Max Horn][]
+and [Wilf A. Wilson][].
+
 ## Version 1.3.0 (released 27/06/2020)
 
 This is a minor release adding the new functionality `DigraphMutabilityFilter`,

PackageInfo.g

@@ -9,14 +9,14 @@
 ##
 
 ##  <#GAPDoc Label="PKGVERSIONDATA">
-##  <!ENTITY VERSION                  "1.3.0">
+##  <!ENTITY VERSION                  "1.3.1">
 ##  <!ENTITY GAPVERS                  "4.10.0">
 ##  <!ENTITY GRAPEVERS                "4.8.1">
 ##  <!ENTITY IOVERS                   "4.5.1">
 ##  <!ENTITY ORBVERS                  "4.8.2">
 ##  <!ENTITY DATASTRUCTURESVERS       "0.2.5">
 ##  <!ENTITY NAUTYTRACESINTERFACEVERS "0.2">
-##  <!ENTITY ARCHIVENAME    "digraphs-1.3.0">
+##  <!ENTITY ARCHIVENAME    "digraphs-1.3.1">
 ##  <!ENTITY COPYRIGHTYEARS "2014-20">
 ##  <#/GAPDoc>
 
@@ -28,8 +28,8 @@ _STANDREWSCS := Concatenation(["Jack Cole Building, North Haugh, ",
 SetPackageInfo(rec(
 PackageName := "Digraphs",
 Subtitle := "Graphs, digraphs, and multidigraphs in GAP",
-Version := "1.3.0",
-Date := "27/06/2020",  # dd/mm/yyyy format
+Version := "1.3.1",
+Date := "27/11/2020",  # dd/mm/yyyy format
 License := "GPL-3.0-or-later",
 ArchiveFormats := ".tar.gz",
 

VERSIONS

@@ -8,6 +8,7 @@
 #############################################################################
 ##
 
+release 1.3.1 - 27/11/2020
 release 1.3.0 - 27/06/2020
 release 1.2.1 - 27/05/2020
 release 1.2.0 - 27/03/2020