Allow usage with Monolog 2

[rimas-kudelis]

Additionally:

• the processors now implement ProcessorInterface
• PHPUnit dependency updated to ^8.5 (^9.5 requires additional changes)
• Travis configured to build with currently supported PHP versions
• composer.lock has been removed

Fixes #3

[rimas-kudelis]

@andriesss would you mind reviewing this and tagging a new release if all is good?

[andriesss]

Thanks @rimas-kudelis! Why did you remove the composer.lock file?

[rimas-kudelis]

@andriesss this is a library, what's the point of locking its dependencies? That lock will be ignored when installing this package as a dependency anyway.

Furthermore, should you decide to configure testing dependencies as a matrix (e.g. not just PHP 7.4, 8.0 and 8.1, but instead combinations of these PHP versions with Monolog 1 and 2), composer.lock would probably just get in the way of that.

[rimas-kudelis]

Also notably, Monolog 3 has been released recently. I haven't added it as a supported dependency, because it uses LogRecord objects instead of arrays. Although it seems that that class implements ArrayAccess for BC, so it might just work with extra typehints.

[rimas-kudelis]

@andriesss, Packagist says that "This package is not auto-updated.". Could you ping Packagist as well (or just configure automatic updating)? Thanks!

[andriesss]

@rimas-kudelis done.

[rimas-kudelis]

@andriesss thanks! Also, Travis-CI no longer builds anything on travis-ci.org, so the badge in the README is now misleading.

[andriesss]

@rimas-kudelis could you give me some pointers on how to fix that? It's been a while since I've last used Travis.

[rimas-kudelis]

@andriesss sure, see #5 :)