Merge pull request #9 from koaning/test-on-pr

Update tests.yml

Author: koaning

.github/workflows/tests.yml

@@ -1,14 +1,20 @@
 name: Python package
 
-on: [push]
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2