Update README.md
returning false if user not found
fixing getSubject method
fixing getSubject method
fixing docblocks
Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/tymondesigns/jwt-auth/inspections/c14b5516-3771-43c7-b9fc-dad690e0193d

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Merge pull request #3 from tymondesigns/scrutinizer-patch-1

Scrutinizer Auto-Fixes
fixing param
refactoring provider