renaming main branch

README.md

@@ -21,7 +21,7 @@ ForML
 =====
 
 [![GitHub Build](https://github.com/formlio/forml/workflows/CI%20Build/badge.svg)](https://github.com/formlio/forml/actions/)
-[![Coverage Status](https://img.shields.io/codecov/c/github/formlio/forml/master.svg)](https://codecov.io/github/formlio/forml?branch=master)
+[![Coverage Status](https://img.shields.io/codecov/c/github/formlio/forml/main.svg)](https://codecov.io/github/formlio/forml?branch=main)
 [![Code Style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 ![Lines of Code](https://img.shields.io/tokei/lines/github.com/formlio/forml.svg)
 
@@ -37,7 +37,7 @@ ForML
 [![Issues](https://img.shields.io/github/issues/formlio/forml.svg)](https://github.com/formlio/forml/issues)
 [![Pull Requests](https://img.shields.io/github/issues-pr/formlio/forml.svg)](https://github.com/formlio/forml/pulls)
 [![Contributors](https://img.shields.io/github/contributors/formlio/forml.svg)](https://github.com/formlio/forml/graphs/contributors)
-[![Lst Commit](https://img.shields.io/github/last-commit/formlio/forml.svg)](https://github.com/formlio/forml/commits/master)
+[![Lst Commit](https://img.shields.io/github/last-commit/formlio/forml.svg)](https://github.com/formlio/forml/commits/main)
 
 ForML is a framework for researching, implementing and operating data science projects.