Rename master branch to main (#58)

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
 
 jobs:

.github/workflows/protoc-update.yml

@@ -2,7 +2,7 @@ name: Update protobuf generated files
 
 on:
   push:
-    branches: [master]
+    branches: [main]
 
 jobs:
   protoc-update:

.github/workflows/release-drafter.yml

@@ -4,7 +4,7 @@ name: Release Drafter
 on:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   update_release_draft:

MAINTAINERS.md

@@ -12,5 +12,5 @@ Before creating a release: Check the latest commit passes continuous integration
 
 When the release button on the draft is clicked, GitHub Actions will publish the release to PyPi.
 
-After any push to the master branch, the "protoc-update" workflow is run which updates the generated python protobuf files. This is to ensure that if a contributor has a newer protoc version installed than the protobuf python package, we won't run into any issues.
+After any push to the main branch, the "protoc-update" workflow is run which updates the generated python protobuf files. This is to ensure that if a contributor has a newer protoc version installed than the protobuf python package, we won't run into any issues.