Set release date

doc/geany.1.in

-.TH "GEANY" "1" "November 19, 2017" "geany @VERSION@" ""
+.TH "GEANY" "1" "February 25, 2018" "geany @VERSION@" ""
 .SH "NAME"
 Geany \(em a small and lightweight IDE
 .SH "SYNOPSIS"

doc/geany.txt

@@ -14,10 +14,10 @@
           Frank Lanitz,
           Colomban Wendling,
           Matthew Brush
-:Date: 2017-11-19
+:Date: 2018-02-25
 :Version: |(version)|
 
-Copyright © 2005-2017
+Copyright © 2005-2018
 
 This document is distributed under the terms of the GNU General Public
 License as published by the Free Software Foundation; either version 2

geany_private.rc

@@ -22,7 +22,7 @@ FILETYPE			VFT_APP
 			VALUE "FileVersion", VER_FILEVERSION_STR
 			VALUE "FileDescription", "Geany"
 			VALUE "InternalName", "Geany"
-			VALUE "LegalCopyright", "Copyright 2005-2017 by the Geany developers"
+			VALUE "LegalCopyright", "Copyright 2005-2018 by the Geany developers"
 			VALUE "LegalTrademarks", ""
 			VALUE "OriginalFilename", "Geany.exe"
 			VALUE "ProductName", "Geany"