Update pypi badge every 4 hours

Does 4 hours sound good? Not sure what is appropriate ...
hammerlab · Sep 28, 2016 · 549f988 · 549f988
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commit 549f988
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
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-[![PyPI](https://img.shields.io/pypi/v/cohorts.svg?maxAge=2592000)]() [![Build Status](https://travis-ci.org/hammerlab/cohorts.svg?branch=master)](https://travis-ci.org/hammerlab/cohorts) [![Coverage Status](https://coveralls.io/repos/hammerlab/cohorts/badge.svg?branch=master&service=github)](https://coveralls.io/github/hammerlab/cohorts?branch=master)
+[![PyPI](https://img.shields.io/pypi/v/cohorts.svg?maxAge=21600)]() [![Build Status](https://travis-ci.org/hammerlab/cohorts.svg?branch=master)](https://travis-ci.org/hammerlab/cohorts) [![Coverage Status](https://coveralls.io/repos/hammerlab/cohorts/badge.svg?branch=master&service=github)](https://coveralls.io/github/hammerlab/cohorts?branch=master)
 
 Cohorts
 =======