解决 travis-ci 不再支持 Python 2.6、 Python 3.3 以及 pypy 的问题

.travis.yml

@@ -1,15 +1,20 @@
 language: python
-python:
-  - 3.5
-
-sudo: false
+dist: trusty
+python: 3.6
+sudo: required
+before_install:
+ - sudo add-apt-repository -y ppa:deadsnakes/ppa
+ - sudo add-apt-repository -y ppa:pypy/ppa
+ - sudo apt-get -qq update
+ - sudo apt-get -y install python2.6 python3.3 pypy
 
 env:
   - TOX_ENV=py26
   - TOX_ENV=py27
   - TOX_ENV=py33
   - TOX_ENV=py34
   - TOX_ENV=py35
+  - TOX_ENV=py36
   - TOX_ENV=pypy
   - TOX_ENV=py2_snownlp
   - TOX_ENV=py2_jieba
@@ -36,9 +41,3 @@ notifications:
   email:
     on_success: never
     on_failure: always
-
-matrix:
-  include:
-    - python: 3.6
-      env:
-        - TOX_ENV=py36