Add DataSets.PROJECT_VERSION (#28)

This allows backends to check the DataSets version without loading the
associated Project.toml

Author: c42f

Project.toml

@@ -1,7 +1,7 @@
 name = "DataSets"
 uuid = "c9661210-8a83-48f0-b833-72e62abce419"
 authors = ["Chris Foster <[email protected]> and contributors"]
-version = "0.2.4"
+version = "0.2.5"
 
 [deps]
 AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"

src/DataSets.jl

@@ -9,6 +9,14 @@ using Base: PkgId
 export DataSet, dataset, @datafunc, @datarun
 export Blob, BlobTree, newfile, newdir
 
+"""
+The current DataSets version number
+"""
+const PACKAGE_VERSION = let
+    project = TOML.parsefile(joinpath(pkgdir(DataSets), "Project.toml"))
+    VersionNumber(project["version"])
+end
+
 include("paths.jl")
 
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