Default logger formatter is now not GSC specific

A new formatter that does not have Google Cloud specific fields is introduced and is used by default. (Thanks to @akoutmos.)

If you migrate from 3.X.X version and don't want logs structure to change please explicitly set Google Cloud formatter in your config.ex:

config :logger_json, :backend, formatter: LoggerJSON.Formatters.GoogleCloudLogger

3.1.2

Fixed a bug where RAM consumption can be very high due to a bug in Jason: michalmuskala/jason#94. It's recommended to upgrade to this version if you handle a large volume of logs.