Merge pull request #420 from opcm/opcm-simdjson-macos-build

Update macosx_build.yml

Author: opcm

.github/workflows/macosx_build.yml

@@ -13,6 +13,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: install simdjson
+      uses: actions/checkout@v2
+      with:
+        repository: simdjson/simdjson
+        path: src/simdjson    
     - name: cmake
       run: |
         rm -rf ${{ github.workspace }}/build