Add an AArch64 worker to the CI

Author: linkmauve

.travis.yml

@@ -28,6 +28,13 @@ matrix:
     - env: NAME=features-test
       rust: nightly
       script: ./test_features.sh
+    - env: NAME=test-aarch64
+      arch: arm64
+      rust: stable
+      script:
+        - cargo test --verbose --release --features asm --package sha-1 --package sha2
+        - cargo bench --verbose --package sha-1 --package sha2
+        - cargo bench --verbose --features asm --package sha-1 --package sha2
 
 install:
   - cargo install cross || true