Fix coding standards

lib/uh/wm/env.rb

@@ -7,9 +7,9 @@ module Uh
 
       attr_reader :output, :logger
 
-      def initialize output, logger_: Logger.new(output)
+      def initialize output, logger: Logger.new(output)
         @output = output
-        @logger = logger_
+        @logger = logger
       end
     end
   end

spec/uh/wm/env_spec.rb

@@ -3,7 +3,7 @@ module Uh
     RSpec.describe Env do
       let(:output)  { StringIO.new }
       let(:logger)  { Logger.new(StringIO.new) }
-      subject(:env) { described_class.new output, logger_: logger }
+      subject(:env) { described_class.new output, logger: logger }
 
       describe '#logger' do
         it 'returns a logger' do