Update README.md

README.md

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 # Grade Conversion Calculator
 
-[![Build Status](https://github.com/uw-it-aca/grade-conversion-calculator/workflows/tests/badge.svg?branch=master)](https://github.com/uw-it-aca/grade-conversion-calculator/actions)
-[![Coverage Status](https://coveralls.io/repos/github/uw-it-aca/grade-conversion-calculator/badge.svg?branch=master)](https://coveralls.io/github/uw-it-aca/grade-conversion-calculator?branch=master)
+[![Build Status](https://github.com/uw-it-aca/grade-conversion-calculator/workflows/tests/badge.svg?branch=main)](https://github.com/uw-it-aca/grade-conversion-calculator/actions)
+[![Coverage Status](https://coveralls.io/repos/github/uw-it-aca/grade-conversion-calculator/badge.svg?branch=main)](https://coveralls.io/github/uw-it-aca/grade-conversion-calculator?branch=main)
 [![PyPi Version](https://img.shields.io/pypi/v/uw-grade-conversion-calculator.svg)](https://pypi.python.org/pypi/uw-grade-conversion-calculator)
 ![Python versions](https://img.shields.io/pypi/pyversions/uw-grade-conversion-calculator.svg)