ci: use 'cargo test --examples' (#53)

Author: daviddrysdale

.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
           toolchain: ${{ matrix.rust }}
           components: rustfmt
           override: true
-      - run: for eg in `ls examples/*.rs | xargs basename --suffix=.rs`; do cargo run --example ${eg}; done
+      - run: cargo test --examples
 
   no_std:
     name: Build for a no_std target