Relax loggerinterface requirement

[benrcole]

Would it be acceptable to relax the definition of the logging for this library so that any PSR\Logger\LoggerInterface can be used?

I'm using this as part of a wider system and want to use the centralised loggers but the requirement for smpp\LoggerInterface is causing me problems.

If that's acceptable I'll submit a suggestion and a pull request.

[alexandr-mironov]

Hello, yeap, its acceptable,
smpp\LoggerInterface is clone of PSR\Logger\LoggerInterface, im understand its not a best solution but has not enough motivation to fix it