CI: build for 0.15, 0.16, master

Author: agagniere

.github/workflows/ci.yml

@@ -16,6 +16,9 @@ jobs:
       matrix:
         zig-version: ["master", "0.15.2"]
         os: [ubuntu-latest, macos-latest]
+        include:
+          - zig-version: "0.16.0"
+            os: ubuntu-latest
 
     runs-on: ${{ matrix.os }}