Removing DataStructures 0.17 from Project.toml (#138)

* bump DataStructures.jl to only 0.18, bump SymbolicUtils.jl patch version to 0.6.1

* rm Manifest.toml

Author: anandijain

Project.toml

@@ -1,7 +1,7 @@
 name = "SymbolicUtils"
 uuid = "d1185830-fcd6-423d-90d6-eec64667417b"
 authors = ["Shashi Gowda"]
-version = "0.6.0"
+version = "0.6.1"
 
 [deps]
 AbstractAlgebra = "c3fe647b-3220-5bb0-a1ea-a7954cac585d"
@@ -14,7 +14,7 @@ TimerOutputs = "a759f4b9-e2f1-59dc-863e-4aeb61b1ea8f"
 [compat]
 AbstractAlgebra = "0.9, 0.10, 0.11"
 Combinatorics = "1.0"
-DataStructures = "0.17, 0.18"
+DataStructures = "0.18"
 NaNMath = "0.3"
 SpecialFunctions = "0.10"
 TimerOutputs = "0.5"