Upgrade to release 4.1.0:

- Add support for breadcrumbs. These are short log statements that
  are attached to error reports to help diagnose what events led
  to the error.
- Apply filtering with params_filters to bytes, not just strings

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>