upgrade pip, setuptools on Travis

Author: minrk

.travis.yml

@@ -18,6 +18,7 @@ env:
     - GROUP=js/services
     - GROUP=js/tree
 before_install:
+    - pip install --upgrade pip setuptools
     - 'if [[ $GROUP == js* ]]; then npm install -g [email protected]; fi'
     - git clone --quiet --depth 1 https://github.com/minrk/travis-wheels travis-wheels
 install: