Add formatter= method to make the logging gem compatible with rails 7.1

[ag4ta]

Hi,

Following the convention to make the logging gem compatible with Rails versions I added empty formatter=(_formatter) method.

This PR is my attempt to solve the issue #245

As I investigated Rails 7.1 introduces some changes in Rails logger and when someone upgrades their Rails they get the error:

NoMethodError: undefined method `formatter='

Here is the link to Rails guide with details.

@TwP could you please take a look at this PR? I would be very happy if this is proper way to solve the issue and if it would be merged 😊

Resolves issue: #245

[juna-nb]

Confirming this also fixes the issue for me using Rails 7.1 and Ruby 3.3.
I was getting the error while trying to use zormandi/logcraft#5 (comment).
Thanks for the fix @ag4ta, looks like I might need to use a fork of your version until they can push an update.

[TwP]

Thank you for the pull request - apologies for taking so long to get around to pulling this into the main branch.

[mhenrixon]

Thank you for the pull request - apologies for taking so long to get around to pulling this into the main branch.

OSS is hard at times, no hard feelings.