Merge pull request #69 from ayardley/ayardley/fixup_authors.pod

This fixes the Pod error: '=item' outside of any '=over'.

authors.pod

@@ -1,7 +1,11 @@
+=pod
+
 =head1 Authors
 
 This book is the work of many contributors.  They are listed below.
 
+=over 4
+
 =item Jonathan Worthington
 
 Jonathan is a prolific contributor to the Rakudo compiler. He is
@@ -26,3 +30,7 @@ anything related to Perl 6.
 Scott occasionally tries to write things in Perl 6, but mostly hangs out
 on irc.freenode.net on the #perl6 channel and discusses anything that
 piques his interest relating to Perl 6 or its development.
+
+=back
+
+=cut