Merge pull request #11 from onno-vos-dev/fix-call-dropped-metric

Fix call_dropped metric

Merge pull request #10 from onno-vos-dev/fix-return-value-of-preserve…

…_exception

Preserve return value of preserve_exception/2

Merge pull request #4 in KC/circuit_breaker from KFC-194-migration-FR…

…EDP to fred

* commit '4d08fa7ad601f3983a5e6234d9a17672aee41517':
  [KFC-194] Use FREDP repos

 Fix preservation/filtering of exceptions (#4)

This fixes a regression in OTP 20, due to the new format of
exceptions returned from processes spawned with proc_lib.

Tagging as 1.0.0