Make sure travis does not try to test example when testing no-default-features.

.travis.yml

@@ -9,7 +9,7 @@ os:
 
 script:
     - cargo build --verbose
+    - cargo build --no-default-features
     - cargo test --verbose
-    - cargo test --no-default-features --verbose
     - cargo test --features="serde_serialization" --verbose
     - cargo doc --verbose