zint: modernize, https, sha256

Closes Homebrew/homebrew#37557.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/zint.rb

@@ -1,24 +1,22 @@
-require 'formula'
-
 class Zint < Formula
-  homepage 'http://zint.github.io/'
-  url 'https://github.com/downloads/zint/zint/zint-2.4.3.tar.gz'
-  sha1 '300732d03c77ccf1031c485a20f09b51495ef5a3'
+  homepage "https://zint.github.io/"
+  url "https://github.com/downloads/zint/zint/zint-2.4.3.tar.gz"
+  sha256 "de2f4fd0d008530511f5dea2cff7f96f45df4c029b57431b2411b7e1f3a523e8"
   revision 1
 
-  head 'git://zint.git.sourceforge.net/gitroot/zint/zint'
+  head "git://zint.git.sourceforge.net/gitroot/zint/zint"
 
   option "with-qt", "Build the zint-qt GUI"
   deprecated_option "qt" => "with-qt"
 
-  depends_on 'cmake' => :build
-  depends_on 'libpng'
-  depends_on 'qt' => :optional
+  depends_on "cmake" => :build
+  depends_on "libpng"
+  depends_on "qt" => :optional
 
   def install
-    mkdir 'zint-build' do
+    mkdir "zint-build" do
       system "cmake", "..", *std_cmake_args
-      system "make install"
+      system "make", "install"
     end
   end