Minor new features and maintenance update
CHANGELOG
- Dialer: add optional method NetDialTLSContext (#746) @lluiscampos
- Update README (#757) @garyburd
- Remove support for Go 1.8 (#755) @garyburd
- Improve protocol error messages (#754) @garyburd
- Update autobahn example (#753) @garyburd
- Fix broadcast benchmarks (#542) @FZambia
- Use context.Context in TLS handshake (#751) @garyburd
- Modify http Method String Literal to Variable (#728) @thak1411
- Update to match gofmt 1.17 (#750) @garyburd
- Document the allowed concurrency on Upgrader and Dialer (#636) @ghost
- improve echo example (#671) @hellflame
- build: use build matrix; drop Go <= 1.10 (#629) @elithrar
- Fix Docs w.r.t. setting subprotocols (#627) @elithrar
- Fix how the client checks for presence of Upgrade: websocket, Connection: upgrade (#604) @bluetech