coreutils 8.23

Update to latest stable release, use HTTPS on homepage and mirror,
change single quotes to double.

Closes Homebrew/homebrew#30946.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/coreutils.rb

@@ -1,10 +1,10 @@
-require 'formula'
+require "formula"
 
 class Coreutils < Formula
-  homepage 'http://www.gnu.org/software/coreutils'
-  url 'http://ftpmirror.gnu.org/coreutils/coreutils-8.22.tar.xz'
-  mirror 'http://ftp.gnu.org/gnu/coreutils/coreutils-8.22.tar.xz'
-  sha256 '5b3e94998152c017e6c75d56b9b994188eb71bf46d4038a642cb9141f6ff1212'
+  homepage "https://www.gnu.org/software/coreutils"
+  url "http://ftpmirror.gnu.org/coreutils/coreutils-8.23.tar.xz"
+  mirror "https://ftp.gnu.org/gnu/coreutils/coreutils-8.23.tar.xz"
+  sha256 "ec43ca5bcfc62242accb46b7f121f6b684ee21ecd7d075059bf650ff9e37b82d"
 
   bottle do
     cellar :any
@@ -13,8 +13,8 @@ class Coreutils < Formula
     sha1 "4f65c3f9edb862faddb0599a94fd92849c04f973" => :lion
   end
 
-  conflicts_with 'ganglia', :because => 'both install `gstat` binaries'
-  conflicts_with 'idutils', :because => 'both install `gid` and `gid.1`'
+  conflicts_with "ganglia", :because => "both install `gstat` binaries"
+  conflicts_with "idutils", :because => "both install `gid` and `gid.1`"
 
   def install
     system "./configure", "--prefix=#{prefix}",
@@ -24,11 +24,11 @@ class Coreutils < Formula
 
     # Symlink all commands into libexec/gnubin without the 'g' prefix
     coreutils_filenames(bin).each do |cmd|
-      (libexec/'gnubin').install_symlink bin/"g#{cmd}" => cmd
+      (libexec/"gnubin").install_symlink bin/"g#{cmd}" => cmd
     end
     # Symlink all man(1) pages into libexec/gnuman without the 'g' prefix
     coreutils_filenames(man1).each do |cmd|
-      (libexec/'gnuman'/'man1').install_symlink man1/"g#{cmd}" => cmd
+      (libexec/"gnuman"/"man1").install_symlink man1/"g#{cmd}" => cmd
     end
   end
 
@@ -51,8 +51,8 @@ class Coreutils < Formula
   def coreutils_filenames (dir)
     filenames = []
     dir.find do |path|
-      next if path.directory? or path.basename.to_s == '.DS_Store'
-      filenames << path.basename.to_s.sub(/^g/,'')
+      next if path.directory? or path.basename.to_s == ".DS_Store"
+      filenames << path.basename.to_s.sub(/^g/,"")
     end
     filenames.sort
   end