Make repositories enumerable

lib/planet_express/repository.rb

@@ -1,15 +1,23 @@
 module PlanetExpress
   class Repository
+    include Enumerable
+
     attr_reader :data
 
-    def initialize(data: )
+    def initialize(data:)
       @data = data
     end
 
-   def all
+    def all
       data
     end
 
+    def each
+      data.each do |item|
+        yield item
+      end
+    end
+
     def add(item)
       data.push(item)
     end