Update dircycle.plugin.zsh

Added dirhistory-like go up a directory (insert-cycledup) and go down to first child directory (insert-cycleddown).

plugins/dircycle/dircycle.plugin.zsh

@@ -43,6 +43,27 @@ insert-cycledright () {
 }
 zle -N insert-cycledright
 
+insert-cycledup () {
+	switch-to-dir .. || return
+
+	local fn
+	for fn (chpwd $chpwd_functions precmd $precmd_functions); do
+		(( $+functions[$fn] )) && $fn
+	done
+	zle reset-prompt
+}
+zle -N insert-cycledup
+
+insert-cycleddown () {
+        switch-to-dir "$(find . -mindepth 1 -maxdepth 1 -type d | sort -n | head -n 1)" || return
+
+        local fn
+        for fn (chpwd $chpwd_functions precmd $precmd_functions); do
+                (( $+functions[$fn] )) && $fn
+        done
+        zle reset-prompt
+}
+zle -N insert-cycleddown
 
 # These sequences work for xterm, Apple Terminal.app, and probably others.
 # Not for rxvt-unicode, but it doesn't seem differentiate Ctrl-Shift-Arrow