Add stacktrace to error log when subscriber.process/1 fails

[JediLuke]

//cc @otobus @mustafaturan

Description

Update logger.error function to use Stacktrace, to make tracing the source of errors easier.

Changes

Added STACKTRACE to the params when logging the error

Is it ready?

• Created an issue and defined what the problem is
• Fixed the defined issue
• The changes have only one commit (if possible please answer the why question with your commit message, and ofcourse a commit may have multiple messages)
• The changes don't break current functionality
• All tests are covered and passing travis
• Used Elixir formatter for only modified file and fixed any of them breaks current consistency.
• Added specs and docs if a new function introduced
• Updated specs and docs if changed any params of a function
• Updated changelog
• Updated readme
• Didn't bump the version

References

• Issue Add custom error handler #169

No custom error handler, this just adds the stacktrace to the error message, which was an annoyance I had when developing.

Love this project by the way ❤️

[mustafaturan]

Hi @JediLuke ,
Thanks for the contribution, can you please merge your change into 1 commit?