Remove 'self' dependency for 5.17.6+ versions.

Hello. gugod.
I am KHS on CPAN.

Thank you for your efforts.
Your modules are useful for me.

I am using perl5.18.
But as you know, 'self' is not working after 5.17.6. (http://matrix.cpantesters.org/?dist=self+0.34)
So I remove dependency with self on Test::Continuous.

Whatever, I believe self is brilliant thing.

I hope that Test::Continuous goes abroad more. :-)

Have a good day