Fix multiple json field input. (#98)

.github/workflows/pypi.yml

@@ -8,13 +8,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v1
+      - uses: actions/setup-python@v2
         with:
           python-version: "3.x"
       - name: Install and configure Poetry
-        uses: snok/install-poetry@v1.1.1
-        with:
-          virtualenvs-create: false
+        run: |
+          pip install -U pip poetry
+          poetry config virtualenvs.create false
       - name: Build dists
         run: make build
       - name: Pypi Publish