Wonder what would happenn if we build on linux as well

.github/workflows/ci.yml

@@ -14,12 +14,14 @@ jobs:
       fail-fast: false
       matrix:
         node: [12.14.1]
-        os: [macos-10.15, windows-2019]
+        os: [macos-latest, windows-latest, ubuntu-latest]
         include:
-          - os: macos-10.15
+          - os: macos-latest
             friendlyName: macOS
-          - os: windows-2019
+          - os: windows-latest
             friendlyName: Windows
+          - os: ubuntu-latest
+            friendlyName: Linux
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v2