move echo to python3

echo.cgi

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 #fetchs a file - workaround for cross site scripting prevention
 import cgi,requests,sys
 
@@ -7,8 +7,6 @@ form = cgi.FieldStorage()
 url = form["url"].value
 
 response = requests.get(url)
-print "Content-Type: text/text"
-print ""
-
+sys.stdout.write("Content-Type: text/text\n\n")
 sys.stdout.write(response.text)