pup.rb: remove as no longer needed, since homebrew provides one

pup.rb

@@ -1,18 +0,0 @@
-# This file was generated by release.py
-require 'formula'
-class Pup < Formula
-  homepage 'https://github.com/EricChiang/pup'
-  version '0.3.9'
-
-  if Hardware.is_64_bit?
-    url 'https://github.com/EricChiang/pup/releases/download/v0.3.9/pup_darwin_amd64.zip'
-    sha1 'cc7cfc54567eb5b6d6ffdb1784e5c8e462845cca'
-  else
-    url 'https://github.com/EricChiang/pup/releases/download/v0.3.9/pup_darwin_386.zip'
-    sha1 'f83ddac28176bcaca8f80e8182064f7cef62595b'
-  end
-
-  def install
-    bin.install 'pup'
-  end
-end