Relax containers package bounds

Author: solomon-b

matrix-client/matrix-client.cabal

@@ -49,8 +49,8 @@ common common-options
 common lib-depends
   build-depends:       SHA                    ^>= 1.6
                      , base64                 >= 0.4.2 && < 0.5
-                     , containers             >= 0.6.5 && < 0.7
                      , bytestring             >= 0.11.3 && < 0.13
+                     , containers             >= 0.6.5 && < 0.8
                      , exceptions             >= 0.10.4 && < 0.11
                      , hashable               >= 1.4.0 && < 1.5
                      , http-client            >= 0.5.0    && < 0.8