add 0x04 Reason Code functionality

[dgduncan]

Adds functionality for DISCONNECT REASON CODE 0x04. This increases compliance of the SPARKPLUG B 3.0.0 specification documentation.

Sparkplug [tck-id-payloads-ndeath-will-message-publisher-disconnect-mqtt50]

MQTT V5 [MQTT-3.1.2.5] Non-normative comment

[coveralls]

Pull Request Test Coverage Report for Build 8864735244

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 98.675%

---

Files with Coverage Reduction	New Missed Lines	%
server.go	6	98.86%
<!--	Total:	6

Totals
Change from base Build 8708963763:	-0.1%
Covered Lines:	6107
Relevant Lines:	6189

---

💛 - Coveralls