depend on sb-md5 properly with asdf

Author: bo-tato

ql-https.asd

@@ -9,7 +9,7 @@
   :bug-tracker "https://github.com/rudolfochrist/ql-https/issues"
   :source-control (:git "https://github.com/rudolfochrist/ql-https.git")
   :version (:read-file-line "version")
-  :depends-on ((:require "uiop"))
+  :depends-on ((:require "uiop") (:feature :sbcl :sb-md5))
   :components ((:file "ql-https"))
   :description "Enable HTTPS in Quicklisp"
   :long-description

ql-https.lisp

@@ -51,7 +51,6 @@
 #+sbcl
 (defun md5 (file)
   "Returns md5sum of FILE"
-  (require 'sb-md5)
   (format nil "~{~2,'0x~}" (coerce (sb-md5:md5sum-file file) 'list)))
 
 #-sbcl