Run the test job on many OSs (#142)

Author: JSorngard

.github/workflows/rust.yml

@@ -42,10 +42,11 @@ jobs:
       run: cargo clippy --all-features -- -D warnings
 
   test:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
         toolchain: [stable, beta]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master