Update to 0.23.1

Author: vslavik

Gettext.Tools.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
     <metadata>
         <id>Gettext.Tools</id>
-        <version>0.23</version>
+        <version>0.23.1</version>
         <title>GNU gettext tools for Windows</title>
         <authors>Vaclav Slavik</authors>
         <license type="expression">GPL-3.0-or-later</license>

Makefile

@@ -1,5 +1,5 @@
 
-GETTEXT_VERSION   = 0.23
+GETTEXT_VERSION   = 0.23.1
 LIBICONV_VERSION  = 1.17
 
 # version of the gettext-tools-windows package; usually same as GETTEXT_VERSION