Fixed typo

Author: abrgr

lib/apns/core.rb

@@ -75,7 +75,7 @@ def self.open_conn_with_proxy(host, port)
     sock << "Proxy-Authorization: Basic #{["#{proxy_uri.user}:#{proxy_uri.password}"].pack("m").chomp}\r\n" if proxy_uri.user
     sock << "\r\n"
 
-    buffer = Net.BufferedIO.new(sock)
+    buffer = Net::BufferedIO.new(sock)
     response = Net::HTTPResponse.read_new(buffer)
     if not response.is_a? Net::HTTPOK
       raise SocketError.new("Proxy refused connection [#{response.code}]")