switch Fiveam to parachute (testing framework).

There is no immediate or obvious reason for the change. I just prefer
to work with parachute.

tests/packages.lisp

@@ -1,7 +1,7 @@
 (in-package :asdf-user)
 (defpackage :ritherdon-archive-tests
   (:use :common-lisp
-        :fiveam
+        :parachute
         :ritherdon-archive))
 
 

tests/test-ritherdon-archive.lisp

@@ -1,12 +1,16 @@
 (in-package :ritherdon-archive-tests)
 
-;; Define your project tests here...
+#| parachute: https://shinmera.github.io/parachute/
+================================================================================
+Use the URL to access the documentation for parachute.
+|#
 
-(def-suite testmain
-    :description "test suite 1")
-
-(in-suite testmain)
-
-(test test1
-  (is (= (+ 1 1)
-         3)))
+;; This was an example taken from the doc's for parachute. I'm going to keep it
+;; here as a reference until I get comfortable with parachute.
+(define-test reference-tests
+  (of-type integer 5)
+  (true (numberp 2/3))
+  (false (numberp :keyword))
+  (is-values (values 0 "1")
+    (= 0)
+    (equal "1")))