tidy up code in Pry::Config.

lib/pry/config.rb

@@ -24,7 +24,7 @@ class Pry::Config
   def method_missing(name, *args, &block)
     key = name.to_s
     if key[-1] == ASSIGNMENT
-      short_key = key.to_s[0..-2]
+      short_key = key[0..-2]
       self[short_key] = args[0]
     elsif @lookup.has_key?(key)
       self[key]
@@ -55,7 +55,7 @@ class Pry::Config
   end
 
   def to_h
-    to_hash
+    @lookup
   end
 
   def quiet?