Do not run benchmarks in the pipline.

ref #425

Author: meltinglava

.travis.yml

@@ -17,4 +17,4 @@ script:
       cargo build --verbose --no-default-features &&
       cargo build --verbose --features "$FEATURES" &&
       cargo test --verbose --features "$FEATURES" &&
-      cargo bench --verbose --features "$FEATURES"
+      cargo bench --no-run --verbose --features "$FEATURES"