Preserve original backtrace when raising GitHub::Error

Library/Homebrew/utils.rb

@@ -266,18 +266,18 @@ module GitHub extend self
     end
   rescue OpenURI::HTTPError => e
     if e.io.meta['x-ratelimit-remaining'].to_i <= 0
-      raise Error, <<-EOS.undent
+      raise Error, <<-EOS.undent, e.backtrace
         GitHub #{Utils::JSON.load(e.io.read)['message']}
         You may want to create an API token: https://github.com/settings/applications
         and then set HOMEBREW_GITHUB_API_TOKEN.
         EOS
     else
-      raise Error, e.message
+      raise Error, e.message, e.backtrace
     end
   rescue SocketError, OpenSSL::SSL::SSLError => e
-    raise Error, "Failed to connect to: #{url}\n#{e.message}"
+    raise Error, "Failed to connect to: #{url}\n#{e.message}", e.backtrace
   rescue Utils::JSON::Error => e
-    raise Error, "Failed to parse JSON response\n#{e.message}"
+    raise Error, "Failed to parse JSON response\n#{e.message}", e.backtrace
   end
 
   def issues_matching(query)