use stable chrome

pkgs/sse/.travis.yml

diff --git a/pkgs/sse/.travis.yml b/pkgs/sse/.travis.yml
index 9aa1d3c..3b66d0d 100644
--- a/pkgs/sse/.travis.yml
+++ b/pkgs/sse/.travis.yml
@@ -4,6 +4,7 @@
 sudo: required
 dist: trusty
 addons:
+  chrome: stable
   apt:
     sources:
       - google-chrome