Rename Interpreter class as Worker

lib/producer/core/cli.rb

@@ -28,7 +28,7 @@ module Producer
         @stdout     = stdout
       end
 
-      def run(worker: Interpreter.new)
+      def run(worker: Worker.new)
         load_recipe
         worker.process recipe.tasks
       end

lib/producer/core/worker.rb

@@ -1,6 +1,6 @@
 module Producer
   module Core
-    class Interpreter
+    class Worker
       def process(tasks)
         tasks.each { |t| process_task t }
       end