Makes sure we can have nightlies for non-pre-releases as well

src/Umbraco.Core/SemVersionExtensions.cs

@@ -0,0 +1,12 @@
+using Semver;
+
+namespace Umbraco.Core
+{
+    public static class SemVersionExtensions
+    {
+        public static string ToSemanticString(this SemVersion semVersion)
+        {
+            return semVersion.ToString().Replace("--", "-").Replace("-+", "+");
+        }
+    }
+}