Rakefile in bullet-5.7.5 vs Rakefile in bullet-5.7.6

@@ -1,5 +1,5 @@
-$LOAD_PATH.unshift File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift File.expand_path('lib', __dir__)
 require 'bundler'
 Bundler.setup
 
 require 'rake'
 require 'rspec'