ICliGetCompletionsGetCompletions Method
            This method will be called for every option and argument, you should switch according to the property name
            which corresponds to the option or argument whose completions will be retrieved.
            
Namespace: DotMake.CommandLineAssembly: DotMake.CommandLine (in DotMake.CommandLine.dll) Version: 2.8.2
IEnumerable<CompletionItem> GetCompletions(
	string propertyName,
	CompletionContext completionContext
)
- propertyName  String
 - The property name which corresponds to the current option or argument.
 - completionContext  CompletionContext
 - The completion context.
 
IEnumerableCompletionItemAn enumerable list of 
CompletionItem.