Update badges in README. Add codacy; remove travis and python.

README.md

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-[![python](https://img.shields.io/badge/python-3.7-g.svg)]()
-[![Build Status](https://travis-ci.com/mwvgroup/Pitt-Google-Broker.svg?branch=master)](https://travis-ci.com/mwvgroup/Pitt-Google-Broker)
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 # Pitt-Google Alert Broker
 
+[![Codacy Badge](https://app.codacy.com/project/badge/Grade/93e282e9d5784de6a46e6b87ab6d0afa)](https://app.codacy.com/gh/mwvgroup/Pitt-Google-Broker/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
+[![Documentation Status](https://readthedocs.org/projects/pitt-broker/badge/?version=latest)](https://pitt-broker.readthedocs.io/en/latest/?badge=latest)
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 The Pitt-Google broker is an astronomical alert broker that is being developed for large scale surveys of the night sky, particularly the upcoming [Vera Rubin Observatory's Legacy Survey of Space and Time](https://www.lsst.org/) (LSST).
 We currently process and serve the [Zwicky Transient Facility](https://www.ztf.caltech.edu/)'s (ZTF) nightly alert stream.
 The broker runs on the [Google Cloud Platform](https://cloud.google.com) (GCP).