More reduction

Author: phansch

.github/workflows/rust.yml

@@ -11,12 +11,7 @@ env:
 
 jobs:
   default_features:
-    strategy:
-      matrix:
-        rust: ["stable", "beta", "nightly"]
-        os: [windows-latest, ubuntu-latest]
-
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
@@ -25,7 +20,7 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: ${{ matrix.rust }}
+        toolchain: stable
         override: true
 
     - name: Run tests