Use a test matrix to test feature combinations

.github/workflows/test.yml

@@ -6,6 +6,10 @@ jobs:
   build_and_test:
     name: yup-oauth2
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        features: ["hyper-rustls", "hyper-tls", "hyper-rustls,hyper-tls", ""]
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -16,18 +20,7 @@ jobs:
       - uses: actions-rs/cargo@v1
         with:
           command: test
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --all-features
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --no-default-features --tests --examples
-      - uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --examples
+          args: --no-default-features --features=${{ matrix.features }}
 
   doc:
     name: yup-oauth2