Try to upgrade pip on Travis for better wheel support.

407611da · Jason Madden · f518b140 · 407611da
Commit 407611da authored Jun 01, 2015 by Jason Madden
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.travis.yml .travis.yml +2 -2

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--- a/.travis.yml
+++ b/.travis.yml
@@ -8,8 +8,8 @@ env:
    - TOXENV=py33
    - TOXENV=py34
 install:
-    - travis_retry pip install tox
-    - travis_retry pip install cython
+    - travis_retry pip install -U pip
+    - travis_retry pip install -U tox,cython
 script:
    - tox
 notifications: