use Firefox latest stable (v35.0)

PeterDaveHello · PeterDaveHello · commit b1c38960d67d · 2015-01-15T19:49:10.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ language: python
 python:
   - "2.7"
 addons:
-  firefox: "33.1.1"
+  firefox: "35.0"
 install:
   - sudo apt-get -qq install libxml2-dev libxslt-dev python-dev
   - pip install -r requirements.txt
