Allow qualification of help command.

This allows the help command to provide help on subcommands.

Author: marc0der

src/main/bash/sdkman-main.sh

@@ -124,7 +124,7 @@ function sdk() {
 
 	# Check whether the candidate exists
 	local sdkman_valid_candidate=$(echo ${SDKMAN_CANDIDATES[@]} | grep -w "$QUALIFIER")
-	if [[ -n "$QUALIFIER" && "$COMMAND" != "offline" && "$COMMAND" != "flush" && "$COMMAND" != "selfupdate" && "$COMMAND" != "env" && "$COMMAND" != "completion" && "$COMMAND" != "edit" && -z "$sdkman_valid_candidate" ]]; then
+	if [[ -n "$QUALIFIER" && "$COMMAND" != "help" && "$COMMAND" != "offline" && "$COMMAND" != "flush" && "$COMMAND" != "selfupdate" && "$COMMAND" != "env" && "$COMMAND" != "completion" && "$COMMAND" != "edit" && -z "$sdkman_valid_candidate" ]]; then
 		echo ""
 		__sdkman_echo_red "Stop! $QUALIFIER is not a valid candidate."
 		return 1