add StatsBase 0.33 to compat (#178)

* add StatsBase 0.33 to compat

* bump patch version

Author: kleinschmidt

Project.toml

@@ -1,6 +1,6 @@
 name = "StatsModels"
 uuid = "3eaba693-59b7-5ba5-a881-562e759f1c8d"
-version = "0.6.10"
+version = "0.6.11"
 
 [deps]
 DataAPI = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
@@ -15,7 +15,7 @@ Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 DataAPI = "1.1"
 DataStructures = "0.17.0"
 ShiftedArrays = "1.0.0"
-StatsBase = "0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32"
+StatsBase = "0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33"
 Tables = "0.2, 1"
 julia = "1"