exclude test directories and grids (#592)

Author: KazuCocoa

appium_lib.gemspec

@@ -30,5 +30,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rubocop', '~> 0.46.0'
   s.add_development_dependency 'pry'
 
-  s.files = `git ls-files`.split "\n"
+  s.files = `git ls-files`.split("\n").select { |v| !v.match /\A^(ios_tests|android_tests|grid)\/.+/ }
 end