Run CI on pushes to master and pull requests

Author: maxbrunsfeld

.github/workflows/ci.yml

@@ -1,8 +1,12 @@
 name: Build/test
 on:
   push:
+    branches:
+      - master
+  pull_request:
     branches:
       - "**"
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}
@@ -17,6 +21,7 @@ jobs:
           node-version: 14
       - run: npm install
       - run: npm test
+
   test_windows:
     runs-on: windows-2019
     steps: