v1.6.0

• #594 fix: plugin status shows Stopped after configuring or restarting a plugin (@sbender9)
• #599 doc: add admin ui readme with development instructions (@tkurki)
• #600 feat: Open npm url in new tab. Add link title. (@tkurki)
• #605 fix(package): update serialport to version 7.0.2 (@tkurki)
• #606 WEBAPPS.md: fix link to signalk spec (@mpvader)
• #604 fix: make server.stop() return a promise so the tests can wait (@sbender9)
• #596 feature: provide an API to playback and retrieve historical data (@sbender9)
• #593 feature: mdns-ws provider enhancements (@sbender9)
• #602 feature: add ability for plugins to make parts of their config collapsible (@sbender9)
• #609 fix: errors from execute provider don't show on the dashboard (@sbender9)

This version in npm