New Features:

• New decisions can supercede multiple previous decisions
• Decisions can be linked by arbitrary link types. Links between decision records can be defined when a decision record is created, or at any time afterwards with the new adr link command.
• Generates visualisation of history and relationships in Graphviz format

Fixes and Improvements:

• The adr help command lists subcommands (e.g. of adr generate) and can provide help for subcommands.