rake.yml in asciimath2unitsml-0.2.0

- old
+ new

@@ -29,9 +29,11 @@
           - ruby: '3.0'
             os: 'macos-latest'
             experimental: true
     steps:
       - uses: actions/checkout@master
+        with:
+          submodules: true
 
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true