Merge pull request #10 from mazrean/doc/fix-codecov-badge

fix codecov badge

Author: mazrean

README.md

@@ -2,7 +2,7 @@
 
 [![GitHub release](https://img.shields.io/github/release/mazrean/formstream.svg)](https://github.com/mazrean/formstream/releases/)
 ![CI main](https://github.com/mazrean/formstream/actions/workflows/ci.yaml/badge.svg)
-[![codecov](https://codecov.io/gh/mazrean/formstream/branch/master/graph/badge.svg)](https://codecov.io/gh/mazrean/formstream)
+[![codecov](https://codecov.io/gh/mazrean/formstream/branch/main/graph/badge.svg)](https://codecov.io/gh/mazrean/formstream)
 [![Go Reference](https://pkg.go.dev/badge/github.com/mazrean/formstream.svg)](https://pkg.go.dev/github.com/mazrean/formstream)
 
 FormStream is a Golang streaming parser for multipart data, primarily used in web form submissions and file uploads.