Bump to containers < 0.9

Author: tomjaguarpaw

stan.cabal

@@ -153,7 +153,7 @@ library
                      , bytestring >= 0.10 && < 0.13
                      , clay >= 0.14 && < 0.17
                      , colourista >= 0.1 && < 0.3
-                     , containers >= 0.5 && < 0.8
+                     , containers >= 0.5 && < 0.9
                      , cryptohash-sha1 ^>= 0.11
                      , dir-traverse ^>= 0.2.2.2
                      , directory ^>= 1.3