Annotate Psr\Log\LoggerInterface as provided by LogServiceProvider.

The Psr\Log\LoggerInterface was added to app->bind but not added to the
provides array in the LogServiceProvider.

See: https://github.com/itsgoingd/clockwork/issues/67
[4.2] exists true on DatabaseSessionHandler insert
fix phpdoc block for Eloquent Model find method

add null
Merge pull request #5965 from spencerdeinum/add_psr_logger_log_service_provider

[4.2] Annotate Psr\Log\LoggerInterface as provided by LogServiceProvider.
Merge pull request #6124 from dbwhddn10/patch-1

[4.2] Fix PHPDoc Block For Eloquent Model Find Method
Merge pull request #6099 from bashaus/add-exists-to-database-handler-on-insert-4.2

[4.2] Set Exists True On DatabaseSessionHandler