Merge pull request #68 from JuliaAlgebra/compathelper/new_version/2020-08-18-00-10-54-541-110976763

CompatHelper: bump compat for "DataStructures" to "0.18"

Author: blegat

Project.toml

@@ -14,7 +14,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-DataStructures = "0.17"
+DataStructures = "0.17, 0.18"
 MultivariatePolynomials = "0.3.5"
 MutableArithmetics = "0.2"
 Reexport = "0.2"