Version 0.8.1 should have been released as a breaking change

[Anders429]

I had previously started using ocrs at version 0.8.0, which has a public dependency on rten version 0.10.0. However, it seems that the newly released 0.8.1 bumped the dependency on rten to 0.13.1, which means that my usages of my own rten types in the public API of ocrs became broken when running cargo update.

As far as I understand, the general consensus is that updating public dependencies, like rten in this case, should be considered a breaking change for exactly this reason. Would you consider releasing that change as 0.9.0 instead?