Update badges

README.md

@@ -1,6 +1,6 @@
 [![Build Status](https://github.com/VIDA-NYU/reprozip/workflows/Test/badge.svg)](https://github.com/VIDA-NYU/reprozip/actions)
-[![Coverage Status](https://codecov.io/github/VIDA-NYU/reprozip/coverage.svg?branch=1.x)](https://codecov.io/github/VIDA-NYU/reprozip?branch=1.x)
-[![Documentation Status](https://readthedocs.org/projects/reprozip/badge/?version=1.x)](https://docs.reprozip.org/en/1.x/)
+[![Coverage Status](https://codecov.io/github/VIDA-NYU/reprozip/coverage.svg?branch=master)](https://codecov.io/github/VIDA-NYU/reprozip?branch=master)
+[![Documentation Status](https://readthedocs.org/projects/reprozip/badge/?version=master)](https://docs.reprozip.org/en/master/)
 [![Matrix](https://img.shields.io/badge/chat-matrix.org-blue.svg)](https://riot.im/app/#/room/#reprozip:matrix.org)
 [![Say Thanks!](https://img.shields.io/badge/Say%20Thanks-!-1EAEDB.svg)](https://saythanks.io/to/remram44)
 [![status](https://img.shields.io/badge/JOSS-10.21105%2Fjoss.00107-green.svg)](http://joss.theoj.org/papers/b578b171263c73f64dfb9d040ca80fe0)