Use copyright start year rather than range

oalders · oalders · commit 83119b83096d · 2022-01-21T15:37:52.000-05:00
diff --git a/dist.ini b/dist.ini
@@ -3,7 +3,7 @@ author  = Gisle Aas <gisle@activestate.com>
 license = Perl_5
 main_module = lib/Net/HTTP.pm
 copyright_holder = Gisle Aas
-copyright_year   = 2001-2017
+copyright_year   = 2001
 
 [MetaResources]
 x_IRC = irc://irc.perl.org/#lwp
