rake.gemspec in rake-12.3.0 vs rake.gemspec in rake-12.3.1

@@ -3,11 +3,10 @@
 require 'rake/version'
 
 Gem::Specification.new do |s|
   s.name = "rake".freeze
   s.version = Rake::VERSION
-  s.date = "2017-10-25"
   s.authors = ["Hiroshi SHIBATA".freeze, "Eric Hodel".freeze, "Jim Weirich".freeze]
   s.email = ["[e-mail]".freeze, "[e-mail]".freeze, "".freeze]
 
   s.summary = "Rake is a Make-like program implemented in Ruby".freeze
   s.description = <<-DESCRIPTION
@@ -22,10 +21,10 @@
   * Supports parallel execution of tasks.
   DESCRIPTION
   s.homepage = "https://github.com/ruby/rake".freeze
   s.licenses = ["MIT".freeze]
 
-  s.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) } -
+  s.files = %x[git ls-files -z].split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) } -
             %w[.rubocop.yml .travis.yml appveyor.yml]
   s.bindir = "exe"
   s.executables = s.files.grep(%r{^exe/}) { |f| File.basename(f) }
   s.require_paths = ["lib".freeze]