PHPC-980: Skip session spec test on Travis (pending 3.6)

Author: jmikola

tests/session/session-003.phpt

@@ -1,6 +1,7 @@
 --TEST--
 MongoDB\Driver\Session spec test: session cannot be used for different clients
 --SKIPIF--
+<?php if (getenv("TRAVIS")) exit("skip This currently fails on Travis because it doesn't run 3.6 yet"); ?>
 <?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
 <?php NEEDS('STANDALONE'); CLEANUP(STANDALONE); ?>
 --FILE--