Bump project version and include PACKAGE_VERSION attribute

Author: MilesCranmer

Project.toml

@@ -1,7 +1,7 @@
 name = "DynamicExpressions"
 uuid = "a40a106e-89c9-4ca8-8020-a735e8728b6b"
 authors = ["MilesCranmer <miles.cranmer@gmail.com>"]
-version = "0.2.3"
+version = "0.3.0"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

src/DynamicExpressions.jl

@@ -31,4 +31,11 @@ using Reexport
 @reexport import .InterfaceSymbolicUtilsModule: node_to_symbolic, symbolic_to_node
 @reexport import .SimplifyEquationModule: combine_operators, simplify_tree
 
+import TOML: parsefile
+
+const PACKAGE_VERSION = let
+    project = parsefile(joinpath(pkgdir(@__MODULE__), "Project.toml"))
+    VersionNumber(project["version"])
+end
+
 end