Bump version to fileutils-1.0.0 as default gems.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61146 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/fileutils.gemspec

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "fileutils"
-  s.version = '0.7.2'
-  s.date = '2017-02-06'
+  s.version = '1.0.0'
+  s.date = '2017-12-12'
   s.summary = "Several file utility methods for copying, moving, removing, etc."
   s.description = "Several file utility methods for copying, moving, removing, etc."
 
   s.require_path = %w{lib}
   s.files = [".gitignore", ".travis.yml", "Gemfile", "LICENSE.txt", "README.md", "Rakefile", "bin/console", "bin/setup", "fileutils.gemspec", "lib/fileutils.rb"]
-  s.required_ruby_version = ">= 2.5.0dev"
+  s.required_ruby_version = ">= 2.4.0"
 
   s.authors = ["Minero Aoki"]
   s.email = [nil]