Make sure we have coveralls

Signed-off-by: Tim Smith <tsmith@chef.io>

Author: tas50

.travis.yml

@@ -29,6 +29,7 @@ env:
 before_script:
   - sudo iptables -L DOCKER || ( echo "DOCKER iptables chain missing" ; sudo iptables -N DOCKER )
   - eval "$(/opt/chefdk/bin/chef shell-init bash)"
+  - /opt/chefdk/embedded/bin/chef gem install coveralls # needed for chefspecs
 
 script: KITCHEN_LOCAL_YAML=.kitchen.docker.yml /opt/chefdk/embedded/bin/kitchen verify ${INSTANCE}