Proper link to Config::MVP::Reader::INI module

The doc incorrectly pointed to the non-existent Config::INI::MVP::Reader
do not try loading plugin from cpan

this is a stupid fix, but easy
load plugin in bundles just as they are in Config::MVP::Section

...with an exception thrown if the plugin could not be loaded
v2.200008

        - fix a busted link
        - be more consistent in exception-throwing on missing packages
        - fix a dumb test that failed in a git checkout