v0.17.0

What's Changed

• fix: prevent client from crashing when using empty PSK by @JKRhb in #89
• fix(server): actually perform shutdown on connection loss by @JKRhb in #90
• fix!(client): throw SocketException if not connected anymore by @JKRhb in #92
• fix!: make alert handling more robust by @JKRhb in #97

Full Changelog: v0.16.0...v0.17.0