ext/Rakefile in kindlegen-3.1.0 vs ext/Rakefile in kindlegen-3.1.1

@@ -49,11 +49,11 @@
 end
 
 def curl(url, tarball)
   puts "open(#{url})"
   puts "save to #{tarball}"
-  open(url) do |file|
+  URI.open(url) do |file|
     IO.copy_stream(file, tarball)
   end
 end
 
 # unzip for windows
@@ -97,10 +97,10 @@
       url: 'https://web.archive.org/web/20150803131026/https://kindlegen.s3.amazonaws.com/kindlegen_linux_2.6_i386_v2_9.tar.gz' })
 when /mingw32|mswin32/i
   create_task_for_windows(
     { tarball: 'kindlegen_win32_v2_9.zip',
       target: 'kindlegen.exe',
-      url: 'http://web.archive.org/web/20150407060917/http://kindlegen.s3.amazonaws.com/kindlegen_win32_v2_9.zip' })
+      url: 'https://web.archive.org/web/20150407060917/https://kindlegen.s3.amazonaws.com/kindlegen_win32_v2_9.zip' })
 else
   STDERR.puts "Host OS unsupported!"
   exit(1)
 end