Prepare for v1.5.1 release

Author: wilfwilson

.VERSION

@@ -1 +1 @@
-1.5.0
+1.5.1

CHANGELOG.md

@@ -1,9 +1,18 @@
 # CHANGELOG – Digraphs package for GAP
-Copyright © 2014-21 by Jan De Beule, Julius Jonušas, James D. Mitchell,
+Copyright © 2014-22 by Jan De Beule, Julius Jonušas, James D. Mitchell,
 Wilf A. Wilson, Michael Young et al.
 
 Licensing information can be found in the `LICENSE` file.
 
+## Version 1.5.1 (released 29/03/2022)
+
+This minor release contains several bugfixes and technical changes. This includes:
+
+* Bugfix: vertex labels are no longer wrongly retained when using `DigraphEdgeUnion`. This was reported by [Wilf A. Wilson][] in [Issue #496](https://github.com/digraphs/Digraphs/issues/496) and fixed by Joseph Edwards in [PR #507](https://github.com/digraphs/Digraphs/pull/507).
+* Bugfix: a segfault could be caused by calling `OutNeighbours` with an inappropriate argument. This was reported by [Wilf A. Wilson][] in [Issue #518](https://github.com/digraphs/Digraphs/issues/518) and fixed by [James D. Mitchell][] in [PR #519](https://github.com/digraphs/Digraphs/pull/519).
+* [Wilf A. Wilson][] improved the performance of `DigraphAddEdge` for digraphs without edge labels in [PR #509](https://github.com/digraphs/Digraphs/pull/509).
+* [Max Horn][] changed the declaration of the variable `Vertices` to improve compatibility with  Grape in [PR #530](https://github.com/digraphs/Digraphs/pull/530).
+
 ## Version 1.5.0 (released 27/10/2021)
 
 This is a fairly major release of the Digraphs package, containing some bugfixes and several new features. 

PackageInfo.g

@@ -1,23 +1,23 @@
 #############################################################################
 ##
 ##  PackageInfo.g
-##  Copyright (C) 2015-21                                James D. Mitchell
+##  Copyright (C) 2015-22                                James D. Mitchell
 ##
 ##  Licensing information can be found in the README.md file of this package.
 ##
 #############################################################################
 ##
 
 ##  <#GAPDoc Label="PKGVERSIONDATA">
-##  <!ENTITY VERSION                  "1.5.0">
+##  <!ENTITY VERSION                  "1.5.1">
 ##  <!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-1.5.0">
-##  <!ENTITY COPYRIGHTYEARS "2014-21">
+##  <!ENTITY ARCHIVENAME    "digraphs-1.5.1">
+##  <!ENTITY COPYRIGHTYEARS "2014-22">
 ##  <#/GAPDoc>
 
 _STANDREWSMATHS := Concatenation(["Mathematical Institute, North Haugh, ",
@@ -28,8 +28,8 @@ _STANDREWSCS := Concatenation(["Jack Cole Building, North Haugh, ",
 SetPackageInfo(rec(
 PackageName := "Digraphs",
 Subtitle := "Graphs, digraphs, and multidigraphs in GAP",
-Version := "1.5.0",
-Date := "27/10/2021",  # dd/mm/yyyy format
+Version := "1.5.1",
+Date := "29/03/2022",  # dd/mm/yyyy format
 License := "GPL-3.0-or-later",
 ArchiveFormats := ".tar.gz",
 

VERSIONS

@@ -1,13 +1,14 @@
 #############################################################################
 ##
 #W  VERSIONS
-#Y  Copyright (C) 2015-21                                James D. Mitchell
+#Y  Copyright (C) 2015-22                                James D. Mitchell
 ##
 ##  Licensing information can be found in the README.md file of this package.
 ##
 #############################################################################
 ##
 
+release 1.5.1 - 29/03/2022
 release 1.5.0 - 27/10/2021
 release 1.4.1 - 14/05/2021
 release 1.4.0 - 27/01/2021