get travis build working.

Philip Cunningham · Philip Cunningham · commit 808d5760f017 · 2016-09-24T09:36:20.000+01:00
diff --git a/app/CLI.hs b/app/CLI.hs
@@ -1,5 +1,6 @@
 module CLI where
 
+import Data.Monoid
 import Options.Applicative
 
 --------------------------------------------------------------------------------
