Add Python 3.7 to test workflow (#406)

* Add python3.7

* add another

* lint

* Update ci.yml

* Update ci.yml

* Update ci.yml

Co-authored-by: Nicholas Rubin <nickrubin@google.com>

.github/workflows/ci.yml

@@ -82,7 +82,7 @@ jobs:
       - name: Doc check
         run: check/doctest -q
   pytest:
-    name: Pytest Ubuntu
+    name: Pytest Ubuntu Python 3.6
     runs-on: ubuntu-16.04
     steps:
       - uses: actions/checkout@v1
@@ -97,6 +97,22 @@ jobs:
           git config --global user.name ${GITHUB_ACTOR}
       - name: Pytest check
         run: check/pytest --actually-quiet
+  pytest37:
+    name: Pytest Ubuntu Python 3.7
+    runs-on: ubuntu-16.04
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-python@v1
+        with:
+          python-version: '3.7'
+          architecture: 'x64'
+      - name: Install requirements
+        run: |
+          pip install -r requirements.txt
+          pip install -r dev_tools/conf/pip-list-dev-tools.txt
+          git config --global user.name ${GITHUB_ACTOR}
+      - name: Pytest check
+        run: check/pytest --actually-quiet
   coverage:
     name: Coverage check
     runs-on: ubuntu-16.04