schema_version supports defination via version module

[p-alik]

I trapped into exception:

Attribute (schema_version) does not pass the type constraint because: Schema version (currently 'v0.11') must be a string at reader DBIx::Class::DeploymentHandler::Dad::schema_version (defined at ../DBIx-Class-DeploymentHandler/lib/DBIx/Class/DeploymentHandler/Dad.pm line 30

because I used version modul for schema version definition. Therefore I slightly modified your implementation and I hope it could be useful for the other perl geeks.

[coveralls]

Coverage increased (+0.3%) to 92.561% when pulling c206776 on p-alik:master into c9528ca on frioux:master.

[p-alik]

It looks like my PR doesn't meet your approach By default DBIx::Class::DeploymentHandler only uses integers for versions

however if you think it could be useful I'll spend more time because in this state it doesn't work