Workaround bug in Travis?

Travis said "The log length has exceeded the limit of 4 Megabytes (this usually means that test suite is raising the same exception over and over)."
Watching the log I don't see 4 MB of data (https://travis-ci.org/citation-style-language/styles/builds/6688872)
Someone may contact Travis but this patch tries to print less "." just in case this fixes the problem for the time being.