add depth to convertto-json

[mblaschke]

PR Summary

solves “WARNING: Resulting JSON is truncated as serialization has exceeded the set depth of 2”

fixes #395

PR Checklist

• [ n/a] Write Help
• [ n/a] Write Unit Test
• [x] Update CHANGELOG.md

[SebastianSchuetze]

@mblaschke could you just update the module version in the patch part and add a reference in the change log. I could do it later, but I am mobile only for at least a week. It would be faster if you could do it!

[SebastianSchuetze]

@mblaschke I updated the version in the changelog. Thanks for your support!