Minor edits to the README.

README

@@ -1,16 +1,9 @@
-README for mutt-1.5
-===================
-
-When updating mutt from an earlier release or from Mercurial, please
-make sure to read the compatibility notes in ``UPDATING''. Older changes
-between mutt-1.2 and mutt-1.4 are listed in NEWS.
-
-If you got the mutt source code from the public source code
-repository, please read doc/devel-notes.txt to make sure that you have
-a complete development environment.
+When updating mutt from an earlier release or from Git, please
+make sure to read the compatibility notes in ``UPDATING''.
 
 Installation instructions are detailed in ``INSTALL''. The user manual
-is in doc/manual.txt. PGP users should read doc/PGP-Notes.txt.
+is in doc/manual.txt. GnuPG users should use the sample configuration in
+contrib/gpg.rc.
 
 Before you start hacking on mutt, read doc/devel-notes.txt.  Before
 applying patches to mutt, read doc/applying-patches.txt.  Please,