Add back npm run web:install for Travis, but not for all

bin/travis-deploy

@@ -8,4 +8,5 @@ git config --global user.name 'Uppy Bot'
 git config --global user.email 'uppybot@uppy.io'
 
 # because a Travis deploy script has to be a real file
+npm run web:install
 npm run web:deploy --quiet