Add sasl-3.2
specification/capability-negotiation-3.2: CAP LIST may generate multiline replies too
extensions/tls-3.1: add recommendations section
Merge branch 'cap-3.2-caplist'
Merge branch 'tlsrecommendation'
Merge branch 'sasl-3.2'
specification/capability-negotiation-3.2: Use the integer 302 as version instead of "3.2"

Closes issue #72
Enable cap-notify for CAP LS 3.2
Finish example of CAP REQ if server shown a value for cap.