Minimum perl version

[lancew]

As of v0.004 the test of minimum perlversion failed for v5.06.0 (see dist.ini).
I've not changed in the .pm file, so that needs to change, actually I expect cpants failures.

Todo:

• change the SmartRow.pm to have correct version.
• investigate it dist::zilla can set that in the file from the value in the dist.ini

And/or find the code that made the test fail and see if we can use older syntax without making it too convoluted.

[lancew]

As of v0.006 the versions should be OK on v5.010.
It would be interesting to see what if the module could go back to v5.06.0.