chore: rename default branch

Author: ldez

.github/workflows/go-cross.yml

@@ -3,7 +3,7 @@ name: Go Matrix
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 
 jobs:

.github/workflows/main.yml

@@ -3,7 +3,7 @@ name: Main
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 
 jobs:

readme.md

@@ -1,6 +1,6 @@
 # Go library for accessing the deSEC API
 
-[![Build Status](https://github.com/nrdcg/desec/workflows/Main/badge.svg?branch=master)](https://github.com/nrdcg/desec/actions)
+[![Build Status](https://github.com/nrdcg/desec/workflows/Main/badge.svg?branch=main)](https://github.com/nrdcg/desec/actions)
 [![PkgGoDev](https://pkg.go.dev/badge/github.com/nrdcg/desec)](https://pkg.go.dev/github.com/nrdcg/desec)
 [![Go Report Card](https://goreportcard.com/badge/github.com/nrdcg/desec)](https://goreportcard.com/report/github.com/nrdcg/desec)