Added iterate

Added iterate to the packages used list.  I'm not going to use CL:LOOP.

cl-ballistics.asd

@@ -4,7 +4,8 @@
   :description "Describe cl-ballistics here"
   :author "Samuel W. Flint <swflint@flintfam.org"
   :license "GNU GPL"
-  :depends-on (#:cl-mathstats)
+  :depends-on (#:cl-mathstats
+               #:iterate)
   :serial t
   :components ((:file "package")
                (:file "cl-ballistics")))

package.lisp

@@ -1,5 +1,6 @@
 ;;;; package.lisp
 
 (defpackage #:cl-ballistics
-  (:use #:cl))
+  (:use #:cl
+        #:iterate))