V1.7.1 - Important bugfix for fastapi integration

1.7.1 (2022-05-25)

Enhancements

None

Bug Fixes

• Fairly serious bug which affected fastapi integrations with more than 1 request level singleton. The bug caused the
  definitions of the singletons to all point to the last defined singleton. Fixed in #197 thanks to Dag for reporting and
  helping with replication.

Backwards incompatible changes

None