update Guidebook date

doc/Guidebook.mn

@@ -5,7 +5,7 @@
 .ds vr "NetHack 3.6
 .ds f0 "\*(vr
 .ds f1
-.ds f2 "June 1, 2015
+.ds f2 "June 21, 2015
 .\" labeled paragraph start (should be part of tmac.n, but I don't want to
 .\" make changes to that file)
 .\" .PS word

doc/Guidebook.tex

@@ -6,7 +6,6 @@
 %-%% if hyperref isn't available, we can get by with this instead
 %-%%\RequirePackage[errorshow]{tracefnt} \DeclareSymbolFont{typewriter}{OT1}{cmtt}{m}{n}
 %-%\usepackage{longtable}
-\usepackage[T1]{fontenc} 
 \textheight 220mm
 \textwidth 160mm
 \oddsidemargin 0mm
@@ -46,7 +45,7 @@
 %.au
 \author{Original version - Eric S. Raymond\\
 (Edited and expanded for 3.6 by Mike Stephenson and others)}
-\date{June 1, 2015}
+\date{June 21, 2015}
 
 \maketitle