Update travis composer-asset-plugin

.travis.yml

@@ -26,7 +26,7 @@ cache:
 
 install:
   - travis_retry composer self-update && composer --version
-  - travis_retry composer global require "fxp/composer-asset-plugin:~1.0.0"
+  - travis_retry composer global require "fxp/composer-asset-plugin:~1.1.0"
   - export PATH="$HOME/.composer/vendor/bin:$PATH"
   - travis_retry composer install --dev --prefer-dist --no-interaction
 # codeception