lib: use print() for python version detection

PR-URL: #1534
Reviewed-By: Refael Ackermann <[email protected]>

Author: greenaddress

lib/configure.js

@@ -437,7 +437,7 @@ PythonFinder.prototype = {
   },
 
   checkPythonVersion: function checkPythonVersion () {
-    var args = ['-c', 'import sys; print "%s.%s.%s" % sys.version_info[:3];']
+    var args = ['-c', 'import sys; print("%s.%s.%s" % sys.version_info[:3]);']
     var env = extend({}, this.env)
     env.TERM = 'dumb'