Update badge links in README.md to main branch (#635)

README.md

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-# Secretive ![Test](https://github.com/maxgoedjen/secretive/workflows/Test/badge.svg) ![Release](https://github.com/maxgoedjen/secretive/workflows/Release/badge.svg)
+# Secretive ![Test](https://github.com/maxgoedjen/secretive/workflows/Test/badge.svg?branch=main) ![Release](https://github.com/maxgoedjen/secretive/workflows/Release/badge.svg)
 
 
 Secretive is an app for storing and managing SSH keys in the Secure Enclave. It is inspired by the [sekey project](https://github.com/sekey/sekey), but rewritten in Swift with no external dependencies and with a handy native management app.