Igor Pstyga

@casperisfine thank you for your PR! Seems like `freeze` is not supported on the older ruby versions.

Hi everyone, I tend to agree with @chaunce on following the Rails approach for migrations to run on specific connections. It might sounds like an overkill, but should be more...

@felixbuenemann I have no objections on that. However, I have never faced to the necessity of using this middleware for all the time I have been using this gem.