Bump version number from "v0.15.0-DEV" to "v0.15.0"

DilumAluthge · DilumAluthge · commit b82e56db19d1 · 2018-06-03T21:20:52.000-04:00
diff --git a/src/base/version.jl b/src/base/version.jl
@@ -1,5 +1,5 @@
 const VERSION = try
-    convert(VersionNumber, "v0.15.0-DEV")
+    convert(VersionNumber, "v0.15.0")
 catch e
     warn("While creating PredictMD.VERSION, ignoring error $(e)")
     VersionNumber(0)
