rebase and fix the existing unit tests

Author: arturcic

docs/input/docs/configuration.md

@@ -213,6 +213,10 @@ Sets the format which will be used to format the `CommitDate` output variable.
 
 The header for ignore configuration.
 
+### update-build-number
+
+Configures GitVersion to update the build number or not when running on a build server.
+
 #### sha
 
 A sequence of SHAs to be excluded from the version calculations. Useful when

src/GitVersionCore.Tests/Configuration/ConfigProviderTests.CanWriteOutEffectiveConfiguration.approved.txt

@@ -123,3 +123,4 @@ ignore:
   sha: []
 commit-date-format: yyyy-MM-dd
 merge-message-formats: {}
+update-build-number: false

src/GitVersionCore/Model/Configuration/Config.cs

@@ -118,17 +118,15 @@ private static T MergeObjects<T>(T target, T source)
         [YamlMember(Alias = "merge-message-formats")]
         public Dictionary<string, string> MergeMessageFormats { get; set; } = new Dictionary<string, string>();
 
-        [YamlMember(Alias = "update-build-number ")]
+        [YamlMember(Alias = "update-build-number")]
         public bool? UpdateBuildNumber { get; set; }
 
         public override string ToString()
         {
             var stringBuilder = new StringBuilder();
-            using (var stream = new StringWriter(stringBuilder))
-            {
-                ConfigSerializer.Write(this, stream);
-                stream.Flush();
-            }
+            using var stream = new StringWriter(stringBuilder);
+            ConfigSerializer.Write(this, stream);
+            stream.Flush();
             return stringBuilder.ToString();
         }