Merge pull request ruby#253 from radar/patch-1

Remove date field from rake.gemspec

Author: hsbt

rake.gemspec

@@ -5,7 +5,6 @@ require 'rake/version'
 Gem::Specification.new do |s|
   s.name = "rake".freeze
   s.version = Rake::VERSION
-  s.date = "2017-11-15"
   s.authors = ["Hiroshi SHIBATA".freeze, "Eric Hodel".freeze, "Jim Weirich".freeze]
   s.email = ["hsbt@ruby-lang.org".freeze, "drbrain@segment7.net".freeze, "".freeze]