bump duckling version

Summary: bump to v0.1.6.1

Reviewed By: patapizza

Differential Revision: D8343952

fbshipit-source-id: de76f3e24281bcb6f8bce6b34ab1a873e5766ba9

Author: haoxuany

duckling.cabal

@@ -1,5 +1,5 @@
 name:                duckling
-version:             0.1.6.0
+version:             0.1.6.1
 synopsis:            A Haskell library for parsing text into structured data.
 description:
   Duckling is a library for parsing text into structured data.