Fixed build fail

Author: JakeGinnivan

GitVersionCore/Configuration/Init/SetNextVersion.cs

@@ -0,0 +1,36 @@
+namespace GitVersion.Configuration.Init
+{
+    using System.Collections.Generic;
+    using GitVersion.Configuration.Init.Wizard;
+    using GitVersion.Helpers;
+
+    public class SetNextVersion : ConfigInitWizardStep
+    {
+        protected override StepResult HandleResult(string result, Queue<ConfigInitWizardStep> steps, Config config, string workingDirectory, IFileSystem fileSystem)
+        {
+            if (string.IsNullOrEmpty(result))
+            {
+                steps.Enqueue(new EditConfigStep());
+                return StepResult.Ok();
+            }
+
+            SemanticVersion semVer;
+            if (!SemanticVersion.TryParse(result, string.Empty, out semVer))
+                return StepResult.InvalidResponseSelected();
+
+            config.NextVersion = semVer.ToString("t");
+            steps.Enqueue(new EditConfigStep());
+            return StepResult.Ok();
+        }
+
+        protected override string GetPrompt(Config config, string workingDirectory, IFileSystem fileSystem)
+        {
+            return @"What would you like to set the next version to (enter nothing to cancel)?";
+        }
+
+        protected override string DefaultResult
+        {
+            get { throw new System.NotImplementedException(); }
+        }
+    }
+}