chore: update test script

.github/workflows/test.yml

@@ -13,11 +13,13 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 15.x]
+        node-version: [12.x, 14.x]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+      fail-fast: false
 
     steps:
       - uses: actions/checkout@v2