exe/dupler in dupler-0.1.0 vs exe/dupler in dupler-0.2.0

@@ -1,13 +1,15 @@
 #!/usr/bin/env ruby
-lib = File.expand_path('../../lib', __FILE__)
+# frozen_string_literal: true
+
+lib = File.expand_path("../lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
-require 'rubygems'
-require 'dupler'
+require "rubygems"
+require "dupler"
 
 begin
   Dupler::Cli.start
-rescue Dupler::DuplerException => ex
-  $stderr.puts ex.message
+rescue Dupler::DuplerException => e
+  warn e.message
   exit 1
-end
\ No newline at end of file
+end