update tmuxinator plugin to latest tag from project

https://github.com/aziz/tmuxinator/blob/v0.6.7/completion/tmuxinator.zsh

plugins/tmuxinator/tmuxinator.plugin.zsh

@@ -0,0 +1,22 @@
+#!/usr/bin/env zsh
+# plugin from tmuxinator project:
+# https://github.com/tmuxinator/tmuxinator/blob/v0.6.7/completion/tmuxinator.zsh
+
+if [[ ! -o interactive ]]; then
+    return
+fi
+
+compctl -K _tmuxinator tmuxinator mux
+
+_tmuxinator() {
+  local words completions
+  read -cA words
+
+  if [ "${#words}" -eq 2 ]; then
+    completions="$(tmuxinator commands)"
+  else
+    completions="$(tmuxinator completions ${words[2,-2]})"
+  fi
+
+  reply=("${(ps:\n:)completions}")
+}