Alter comment on travis-ci#8836 workaround

.travis.yml

@@ -4,7 +4,8 @@ dist: trusty
 # we don't need sudo, so can run in a container, which makes startup much
 # quicker.
 #
-# unfortunately we do require sudo as per https://github.com/travis-ci/travis-ci/issues/8836
+# unfortunately we do temporarily require sudo as a workaround for
+# https://github.com/travis-ci/travis-ci/issues/8836
 sudo: required
 
 language: node_js