Revision history for IO-ReadHandle-Include

1.0.0   2018-01-30
        First version.

1.1     2018-08-03
        Declare dependent non-core Perl modules for easier installation.

        If an include file isn't found, then instead of croaking don't
        replace the include directive.

1.2     2018-09-26
        Fix BUG in sub CLOSE.  reftype doesn't return '' but undef if
        its argument is not a reference.

        Fix BUG in sub CLOSE.  Avoid "undefined value" warning if
        main_source option is not defined.

        Avoid infinite recursion when an included file indirectly
        includes itself again.
