Added

• .addHelpOption() as another way of configuring built-in help option (#2006)
• .helpCommand() for configuring built-in help command (#2087)

Changed

• .addHelpCommand() now takes a Command (passing string or boolean still works as before but deprecated) (#2087)
• refactor internal implementation of built-in help option (#2006)
• refactor internal implementation of built-in help command (#2087)

Deprecated

• .addHelpCommand() passing string or boolean (use .helpCommand() or pass a Command) (#2087)