Fix with perl 5.18 by replacing non-ASCII character.

--- lib/Class/Std.pm.orig	Sun Mar 23 23:16:00 2014
+++ lib/Class/Std.pm	Sun Mar 23 23:17:58 2014
@@ -1510,7 +1510,7 @@ other attribute-related behaviours. Each of these opti
 key/value pair, which may be specified in either Perl 5 "fat comma" syntax
 ( C<< S<< key => 'value' >> >> ) or in one of the Perl 6 option syntaxes
 ( C<< S<< :key<value> >> >> or C<< S<< :key('value') >> >> or 
-C<< S<< :key«value» >> >>).
+C<< S<< :key<<value>> >> >>).
 
 Note that, due to a limitation in Perl itself, the complete C<:ATTR> marker,
 including its options must appear on a single line.