limit setuptools required version, since dropping python 3.2 (and pyp…

…y3 - py3.2) support

.travis.yml

@@ -10,7 +10,7 @@ env:
 - XDIST=1 INSTALL=install
 - XDIST=0 INSTALL=develop
 install:
-- pip install "setuptools>=18.0.0"
+- pip install "setuptools>=18.0.0,<30.0.0" # pypy support
 - "pip install -r requirements-test.txt"
 - python setup.py $INSTALL
 - pip install pytest_elasticsearch[tests] coveralls wheel