change master to main (#203)

For the same reasons as in the Certbot change (certbot/certbot@84c8dbc)

Author: jvanasco

.github/workflows/check.yaml

@@ -3,7 +3,7 @@ name: Python Tests for Josepy
 on:
   pull_request:
     branches:
-      - master
+      - main
   push:
   schedule:
     # Run at 4pm UTC or 9am PST
@@ -50,15 +50,15 @@ jobs:
         run: pytest tests
   notify:
     # Only notify about failed builds, do not notify about failed builds for
-    # PRs, and only notify about failed pushes to master.
-    if: ${{ failure() && github.event_name != 'pull_request' && (github.event_name != 'push' || github.ref == 'refs/heads/master') }}
+    # PRs, and only notify about failed pushes to main.
+    if: ${{ failure() && github.event_name != 'pull_request' && (github.event_name != 'push' || github.ref == 'refs/heads/main') }}
     needs: [build, external]
     runs-on: ubuntu-20.04
     steps:
       - name: Write Mattermost Message
         run: |
           WORKFLOW_RUN_URL="$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID"
           echo "{\"text\":\"** :warning: $GITHUB_REPOSITORY: Build failed :warning: ** | [(see details)]($WORKFLOW_RUN_URL) \"}" > mattermost.json
-      - uses: mattermost/action-mattermost-notify@master
+      - uses: mattermost/action-mattermost-notify@main
         env:
           MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_WEBHOOK_URL }}

CHANGELOG.rst

@@ -1,7 +1,7 @@
 Changelog
 =========
 
-1.15.0 (master)
+1.15.0 (main)
 ---------------
 * Added support for Python 3.13.
 * Dropped support for Python 3.7.