Replace Alias Method Chain With Prepend for SchemaDumper

[rience]

In our application we use this gem and strong_migrations that is using prepend method of adding functionality to ActiveRecord::SchemaDumper. Because this one is using alias method chaining - we were hit with stack overflow error when this gem was calling strong_migrations and it was then calling initializer which ended up calling this gem again. This PR changes monkey patching approach to use prepend.

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[Laykou]

@gurkanindibay Could this be merged and released, please?

[Laykou]

@rience I independently made similiar changes here #257 but since your's was first, I'm closing my PR