Fix version continuity

Raku@5bedf61 changed the version to a format incompatible with prior versions. See:

$ perl6 -e 'say Version.new("1.001001") cmp Version.new("1.002")'
More

$ perl6 -e 'say Version.new("1.002") ~~ Version.new("1.001001+")'
False

$ perl6 -e 'say Version.new("1.001001") ~~ Version.new("1.002+")'
True

META6.json

@@ -33,7 +33,7 @@
     "Pod::Convenience": "lib/Pod/Convenience.pm6",
     "Perl6::Documentable::Registry": "lib/Perl6/Documentable/Registry.pm6"
   },
-  "version": "1.002",
+  "version": "1.002001",
   "authors": [ "perl6" ],
   "description": "Perl 6 documentation (tools and docs)",
   "meta6": "0"