Based on https://github.com/zfcampus/zf-api-problem/releases/tag/1.0.3 (commit 5b27f452c221d719621cfee315e58659e79c213b in this repo)

- [zfcampus/zf-api-problem#33](https://github.com/zfcampus/zf-api-problem/pull/33) Ensure non-HTTP exception codes are cast to 500