erd.gemspec in erd-0.3.1 vs erd.gemspec in erd-0.3.2

@@ -5,9 +5,10 @@
   gem.authors       = ['Akira Matsuda']
   gem.email         = ['[e-mail]']
   gem.description   = 'erd engine on Rails'
   gem.summary       = 'erd engine on Rails'
   gem.homepage      = 'https://github.com/amatsuda/erd'
+  gem.license       = 'MIT'
 
   gem.files         = `git ls-files`.split($\)
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.name          = 'erd'