Update action to pull entire history

Signed-off-by: Tim Overly <tim@joinroot.com>

.github/workflows/main.yml

@@ -6,6 +6,8 @@ jobs:
     name: Charts generated by src-d/hercules
     steps:
       - uses: actions/checkout@master
+        with:
+          fetch-depth: 0
       - name: Hercules
         uses: src-d/hercules@master
       - uses: actions/upload-artifact@master