Update nano package (again!) (#2716)

Heroku v2

packages/nano.rb

@@ -3,21 +3,13 @@ require 'package'
 class Nano < Package
   description 'Nano\'s ANOther editor, an enhanced free Pico clone.'
   homepage 'https://www.nano-editor.org/'
-  version '3.0'
-  source_url 'https://www.nano-editor.org/dist/v3/nano-3.0.tar.xz'
-  source_sha256 'e0a5bca354514e64762c987c200a8758b05e7bcced3b00b3e48ea0a2d383c8a0'
+  version '3.1'
+  source_url 'https://www.nano-editor.org/dist/v3/nano-3.1.tar.xz'
+  source_sha256 '14c02ca40a5bc61c580ce2f9cb7f9fc72d5ccc9da17ad044f78f6fb3fdb7719e'
 
   binary_url ({
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/nano-3.0-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/nano-3.0-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/nano-3.0-chromeos-i686.tar.xz',
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/nano-3.0-chromeos-x86_64.tar.xz',
   })
   binary_sha256 ({
-    aarch64: 'dfe6697ad765fb20a78d7a8e7fec8eb3b603ca94d08efb1542667067f91a7904',
-     armv7l: 'dfe6697ad765fb20a78d7a8e7fec8eb3b603ca94d08efb1542667067f91a7904',
-       i686: '63984d3fc80bbf58cdd46ef3fd183e3fd145a0ab50e931a99f789286a05791fa',
-     x86_64: 'dc7d01d8bf910cb2a242687212bea0bedf520006a594ef92f038cc1a1f76cb2a',
   })
 
   depends_on 'filecmd'