Switched default branch name to main

Author: Gérard Collin

.github/workflows/release.yml

@@ -2,7 +2,7 @@ name: Release
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   build:
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-          ref: master
+          ref: main
 
       - name: Set up JDK 16
         uses: actions/setup-java@v2