Do not run tests with --all-features on rust 1.32

.github/workflows/ci.yml

@@ -13,7 +13,14 @@ jobs:
           - beta
           - nightly
         include:
+          - rust: 1.32.0
+            test_features: ""
+          - rust: stable
+            test_features: "--all-features"
+          - rust: beta
+            test_features: "--all-features"
           - rust: nightly
+            test_features: "--all-features"
             allow_failure: true
     steps:
       - uses: actions/checkout@v1
@@ -27,7 +34,7 @@ jobs:
         continue-on-error: ${{ matrix.allow_failure }}
         working-directory: ./schemars
       - name: Run tests
-        run: cargo test --verbose --all-features --no-fail-fast
+        run: cargo test --verbose ${{ matrix.test_features }} --no-fail-fast
         continue-on-error: ${{ matrix.allow_failure }}
         working-directory: ./schemars
       - name: Run derive tests