Enable optimizations when building the 'anansi' executable.
diff --git a/anansi.cabal b/anansi.cabal
index ad7a11b..f910b58 100644
--- a/anansi.cabal
+++ b/anansi.cabal
@@ -67,7 +67,7 @@
 executable anansi
   main-is: Main.hs
   hs-source-dirs: lib,src
-  ghc-options: -Wall
+  ghc-options: -Wall -O2
 
   build-depends:
       base >= 4.0 && < 5.0