Update readme with badges

README.md

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+[![Build Status](https://travis-ci.com/nextstrain/augur.svg?branch=master)](https://travis-ci.com/nextstrain/augur)
+[![PyPI version](https://badge.fury.io/py/nextstrain-augur.svg)](https://pypi.org/project/nextstrain-augur/)
+[![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)
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 # Introduction
 
 Nextstrain is an open-source project to harness the scientific and public health potential of pathogen genome data.
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 Resulting data and inferences are available live at the website [nextstrain.org](https://nextstrain.org).
 Documentation is available at [nextstrain.org/docs](https://nextstrain.org/docs).
 
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 # Augur
 
 *Definition: One held to foretell events by omens.*
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 It provides a collection of commands which are designed to be composable into larger processing pipelines.
 Documentation for augur is available at [nextstrain.org/docs/bioinformatics](https://nextstrain.org/docs/bioinformatics).
 
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 ## Installation
 
 Augur is written in Python 3 and requires at least Python 3.4.