bump StatsBase compat (#291)

Author: palday

Project.toml

@@ -1,6 +1,6 @@
 name = "StatsModels"
 uuid = "3eaba693-59b7-5ba5-a881-562e759f1c8d"
-version = "0.7.1"
+version = "0.7.2"
 
 [deps]
 DataAPI = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
@@ -21,7 +21,7 @@ DataAPI = "1.1"
 DataFrames = "1"
 DataStructures = "0.17, 0.18"
 ShiftedArrays = "1, 2"
-StatsBase = "0.33.5"
+StatsBase = "0.33.5, 0.34"
 StatsFuns = "0.9, 1.0"
 Tables = "0.2, 1"
 WeakRefStrings = "1"