strip no -s

Author: tesuji

.travis.yml

@@ -12,7 +12,7 @@ cache:
   directories:
     - $HOME/.cargo
 before_cache:
-  - strip -s $HOME/.cargo/bin/*
+  - find $HOME/.cargo/bin/ ! -type d -exec strip {} \;
   - cargo install -Z install-upgrade cargo-cache --debug
   - cargo cache --autoclean