chore(ci): use Ubuntu latest

Author: DavidRouyer

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-16.04]
+        os: [macos-latest, windows-latest, ubuntu-latest]
 
     steps:
     - name: Checkout