add company

Author: puredanger

content/community/companies.adoc

@@ -251,6 +251,7 @@ Also, check out the <<success_stories#,Clojure Success Stories>> and <<community
 * https://touk.pl[TouK]
 * https://truckerpath.com[Trucker Path]
 * http://www.twosigma.com/[Two Sigma]
+* https://unacast.com/[Unacast]
 * http://unbounce.com/[Unbounce]
 * https://unfold.com/[Unfold]
 * http://www.uhn.ca/[University Health Network]