simplify require

Author: jameshfisher

pusher.gemspec

@@ -1,9 +1,6 @@
 # -*- encoding: utf-8 -*-
 
-# Copied from https://github.com/bundler/bundler/blob/524add155d6b90c679db21b03f0bd9f877f21ab0/bundler.gemspec#L3-L5
-# but made less cryptic
-$LOAD_PATH.unshift(File.expand_path('../lib/', __FILE__))
-require "pusher/version"
+require File.expand_path('../lib/pusher/version', __FILE__)
 
 Gem::Specification.new do |s|
   s.name        = "pusher"