Update README.md

Author: huangsam

Diff for: README.md

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 # githooks
 
 [![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/huangsam/githooks/ci.yml)](https://github.com/huangsam/githooks/actions)
-[![License](https://img.shields.io/github/license/huangsam/githooks)](https://github.com/huangsam/githooks/blob/master/LICENSE)
+[![License](https://img.shields.io/github/license/huangsam/githooks)](https://github.com/huangsam/githooks/blob/main/LICENSE)
 
 These hooks started out as a collection of policies that I enforced for Python
 projects at [Cisco](https://www.cisco.com/). Many of them execute the