build.yml in magro-0.4.3

- old
+ new

@@ -5,19 +5,19 @@
 jobs:
   build:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        ruby: [ '2.5', '2.6', '2.7' ]
+        ruby: [ '2.5', '2.6', '2.7', '3.0' ]
     steps:
       - uses: actions/checkout@v2
       - name: Install libpng and libjpeg
         run: sudo apt-get install -y libpng-dev libjpeg-dev
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: actions/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
       - name: Build and test with Rake
         run: |
-          gem install bundler
+          gem install --no-document bundler
           bundle install --jobs 4 --retry 3
           bundle exec rake