Update appveyor.yml

appveyor.yml

@@ -14,6 +14,9 @@ install:
   - cargo -V
   
 build: false
+test_script:
+  - cargo test --target "$TARGET" --verbose
+  - cargo run --target "$TARGET" -- src/main.rs README.md --paging=never
 
 before_deploy:
   # Generate artifacts for release