Travis use release build

Author: sorpaas

.travis.yml

@@ -3,6 +3,9 @@ rust:
   - stable
   - beta
   - nightly
+script:
+  - cargo build --release --all --verbose
+  - cargo test --release --all --verbose
 matrix:
   allow_failures:
-    - rust: nightly
+    - rust: nightly