Tombstone Versions Save

• Adding newer packages versions for PHP 8+, #31, thanks to @JimTools

• Add more psr/log versions, #24, thanks to @jawira

• Removing version on bootstrap link header #23, thanks to @wprigollopes

• Removed sebastian/finder-facade as a dependency and added replacement for PHP8 compatibility #20, thanks to @swarrenwecareconnectorg

Added support for static methods as a tombstone function #17, #18, thanks to @lyudmild

Added a configurable tombstone function name, so your tombstone function no longer needs to be named tombstone. Additional benefits:

• The tombstone function doesn't need to be located in the global space, it can be located in a namespace now.
• You can have multiple tombstone functions for different purposes. E.g. have a function that logs every single invocation and have another one that does random sampling.

• Fix log providers to be instantiated through the static create function

• Add custom log provider option to read tombstone logs from an arbitrary logging system

• PHP8 support

Fix undefined index notices when PHP internally calls a method with a tombstone #13, thanks to @X-Coder264