checkout lfs files

.github/workflows/.ci.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Set up Python 3.7
         uses: actions/setup-python@v1
         with:
@@ -26,7 +26,9 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+      with:
+        lfs: true
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with: