Fix Travis build

Fix Travis build

diff --git a/.travis.yml b/.travis.yml
index 8173906..08be343 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -46,6 +46,7 @@ cache:
     - vendor/bundle
 
 before_install:
+  - wget -qO- https://raw.githubusercontent.com/discourse/discourse_docker/master/image/base/install-pngquant | sudo sh
   - nvm install node
   - node --version
   - gem install bundler

GitHub
sha: cb9bee41

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