run tests on pipeline

Fixes #14

.github/workflows/gc-leaderboard.yml

@@ -0,0 +1,23 @@
+name: GitHub Contribution Leaderboard
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pipenv
+        pipenv install
+    - name: Test with pytest
+      run: |
+        pytest