Only install powershell package under windows OS

bundle/bundle--customfile.el

@@ -20,6 +20,8 @@
 	inferior-lisp-program "sbcl"
 	slime-lisp-implementations `((sbcl (,sbcl-exe "--core" ,sbcl-core))))
 
+  (use-package powershell)
+
   (defun powershell (&optional buffer)
     "Launches a powershell in buffer *powershell* and switches to it."
     (interactive)

bundle/bundle--package.el

@@ -193,8 +193,6 @@
                  slime-editing-commands
                  slime-sbcl-exts)))
 
-(use-package powershell)
-
 ;; (use-package geiser
 ;;   :config
 ;;   (setq geiser-active-implementations '(racket)))