Undocumented BC break about migration generator

[VincentLanglet]

BC Break Report

Summary

The migration generator does not replace the same variable between 2.x and 3.0.
It leads to a BC break non documented if you use custom template.

Previous behavior

final class Version<version>

was correctly replaced.

Current behavior

Now it's not. We have to write

final class <classname>

[greg0ire]

@tarlepp documented it with doctrine/DoctrineMigrationsBundle#334, but on the bundle repository. Wouldn't hurt to do it on both I guess.

[VincentLanglet]

I think it can be enough on the bundle.

But I missed it because I looked at the default branch UPGRADE file: https://github.com/doctrine/DoctrineMigrationsBundle/blob/master/UPGRADE.md

[greg0ire]

Right, I will do an up-merge PR (and we should probably change the default branch too)

[VincentLanglet]

Ok, I close this then :)