Fixed typo

Author: Jake Ginnivan

build.cake

@@ -136,7 +136,7 @@ Task("Create-Release-Notes")
                     RedirectStandardOutput = true
                 },
                 out redirectedOutput);
-        Information(string.Join("\n"m redirectedOutput));
+        Information(string.Join("\n", redirectedOutput));
 
         if (!System.IO.File.Exists("./build/releasenotes.md") || string.IsNullOrEmpty(System.IO.File.ReadAllText("./build/releasenotes.md"))) {
             System.IO.File.WriteAllText("./build/releasenotes.md", "No issues closed since last release");