fix AddFormatFor it should trim final newline

Author: jetersen

src/GitVersionCore/Extensions/TemplateManager.cs

@@ -50,7 +50,7 @@ public string GetAddFormatFor(string fileExtension)
 
             if (addFormats.TryGetValue(fileExtension, out var addFormat) && addFormat != null)
             {
-                result = addFormat.ReadAsStringFromEmbeddedResource<TemplateManager>();
+                result = addFormat.ReadAsStringFromEmbeddedResource<TemplateManager>().TrimEnd('\r', '\n');
             }
 
             return result;