Regroup stdlib require calls in main module

lib/uh/wm.rb

@@ -1,3 +1,5 @@
+require 'forwardable'
+require 'logger'
 require 'uh'
 
 require 'uh/wm/cli'

lib/uh/wm/env.rb

@@ -1,6 +1,3 @@
-require 'logger'
-require 'forwardable'
-
 module Uh
   module WM
     class Env