Enhancement: Include failed operation in Exception

[Richard87]

Hi!

Thanks for an awesome project!

We have som Diffs with a lot of operations in each patch, and the exception can be a little hard to troubleshoot.

Would you be interested in a PR that includes the failed operation in the exception?

[vearutop]

Hi, thank you for using this library.

Such PR would definitely be a valuable contribution, please send!

[jakobw]

If I'm not mistaken this is done in #57. All specific exceptions we added there contain the failed operation.