Merge pull request #43 from HENNGE/release-23.7

Release 23.7

Exception info typo fix to close #30

Reproducer for https://curl.haxx.se/mail/lib-2020-03/0044.html

To reproduce, run `docker-compose up --build` in tests/stress,
Then run curl with client cert, noverify, over http/2:

```
curl -v \
-d '{"aps":{"alert":"test","sound":"default"}}' \
-H "apns-topic:com.yourcompanyname.yourappname" \
-H "apns-expiration:1" \
-H "apns-priority:10" \
--http2 \
--cert .fake-cert  \
https://localhost:2197/3/device/blah-blah-token -k
```

Release 19.11.1

19.11 Release