Add completion subcommand to help output

Author: Oliver Weiler

src/main/bash/sdkman-completion.sh

@@ -26,7 +26,10 @@ function __sdk_completion() {
 
 	    case "$previous_word" in
 	    sdk)
-	        candidates=("install" "uninstall" "list" "use" "default" "home" "env" "current" "upgrade" "version" "broadcast" "help" "offline" "selfupdate" "update" "flush")
+	        candidates=("install" "uninstall" "list" "use" "completion" "default" "home" "env" "current" "upgrade" "version" "broadcast" "help" "offline" "selfupdate" "update" "flush")
+	        ;;
+	    completion)
+	        candidates=("bash" "zsh")
 	        ;;
 	    env)
 	        candidates=("init install clear")

src/main/bash/sdkman-help.sh

@@ -26,6 +26,7 @@ function __sdk_help() {
 	__sdkman_echo_no_colour "       uninstall or rm   <candidate> <version>"
 	__sdkman_echo_no_colour "       list      or ls   [candidate]"
 	__sdkman_echo_no_colour "       use       or u    <candidate> <version>"
+	__sdkman_echo_no_colour "       completion        [bash|zsh]"
 	__sdkman_echo_no_colour "       default   or d    <candidate> [version]"
 	__sdkman_echo_no_colour "       home      or h    <candidate> <version>"
 	__sdkman_echo_no_colour "       env       or e    [init|install|clear]"