Update DataStructures Compat Bounds

Restricting to only 0.18 was causing problems with some packages

Project.toml

@@ -1,6 +1,6 @@
 name = "TexTables"
 uuid = "ebf5ac4f-3ec1-555f-9ac9-3d72ed88c471"
-version = "0.2.0"
+version = "0.2.1"
 
 [deps]
 Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
@@ -16,27 +16,26 @@ StatsModels = "3eaba693-59b7-5ba5-a881-562e759f1c8d"
 [compat]
 Compat = "^3.0"
 DataFrames = "0.19, 0.20, 0.21"
-DataStructures = "0.18"
+DataStructures = "0.17, 0.18"
 Distributions = "0.20, 0.21, 0.22, 0.23, 0.24"
 Formatting = "^0.3.3, 0.4"
 GLM = "^1.0"
 Parameters = "0.12"
-StatsBase  = "0.33"
+StatsBase = "0.33"
 StatsModels = "0.6"
 julia = "1"
 
 [extras]
+CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
+DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
+GLM = "38e38edf-8417-5370-95a0-9cbb8c7f171a"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 RDatasets = "ce6b1742-4840-55fa-b093-852dadbb1d8b"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
-Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
-GLM = "38e38edf-8417-5370-95a0-9cbb8c7f171a"
 StatsModels = "3eaba693-59b7-5ba5-a881-562e759f1c8d"
-DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Statistics", "LinearAlgebra", "Test", "RDatasets", "DataFrames", "Random", "CSV", "GLM", "StatsModels","DataStructures"]
-
+test = ["Statistics", "LinearAlgebra", "Test", "RDatasets", "DataFrames", "Random", "CSV", "GLM", "StatsModels", "DataStructures"]