make sure all Moose and Class::MOP classes are loaded from blib

This error was exposed by the last commit, that fixed the VERSION mismatch
check that in turn was (invisibly) broken ever since $VERSION assignment was
moved outside the BEGIN block.

author/doc-generator

@@ -4,14 +4,14 @@ use strict;
 use warnings;
 use autodie;
 
-use Module::Runtime qw( use_module );
-use Moose::Util qw( english_list find_meta );
-use Path::Tiny qw( path );
-
 # We want to make sure that when we load an exception class we're getting the
 # version for the release-to-be, not the installed version.
 use blib;
 
+use Module::Runtime qw( use_module );
+use Moose::Util qw( english_list find_meta );
+use Path::Tiny qw( path );
+
 sub main {
     my $exception_dir = path(qw( lib Moose Exception ));