Configure JsonFormatter parameters via appsettings.json

[johannesmols]

PR #281 added support for constructor parameters in appsettings.json. However, attempting to do this with the JsonFormatter gives an InvalidOperationException as described by @WattsC-90 here. It seems that there a few that have the same issue, and I do too now. Since the PR is merged, I am opening a new issue to get attention to this.

[FaroukOyekunle]

Where you able to complete the solution to this issues @johannesmols.

[johannesmols]

Hi @FaroukOyekunle, I forgot all about this one. The newest comment on the linked issue actually resolves it in my case: #281 (comment). I was also missing the "Serilog" behind the type of the formatter.

[FaroukOyekunle]

Cool! That's right.