Upgrade to assertj-core 3.11.1

[ljrmorgan]

Bump to assertj-core 3.11.1 to resolve NoSuchMethodErrors after a signature changes in assertj-core.

Fixes #13

[ljrmorgan]

The build failure doesn't seem related to the change, doesn't look like it's got as far as compiling anything.

@jrglee Are you happy with the approach that I've taken here? One downside is that this will not work with versions of assertj < 3.11, I could maybe use reflection to work around that but thought it would be best to keep it simple.

[bschelberg]

Seems like this project is dead, this one worked for me: https://github.com/lukas-krecan/JsonUnit. As recommended by Joel Costigliola: https://stackoverflow.com/a/47625667/1303158

[wimdeblauwe]

Would be good if somebody could put that in the readme to avoid waisting time on this project.

[jrglee]

Hello, I no longer work at Revinate since 2019. And I am not a maintainer of this project anymore, nor I have permissions to push any change.

It does look like this library is dead. I recommend you to migrate to an existing one with up-to-date dependencies and more advanced features. Or simplify fork it and keep it up-to-date.

To give some additional context. This library was created back in 2015, from a collection of test utilities that we end up copying between multiple repos. We did not have a good Artifactory deployment, and we thought it was a nice idea to open source it to get hosting and CI for free while giving us an opportunity to be exposed to different tools.

Cheers!