Update CHANGELOG

CHANGELOG.md

@@ -1,5 +1,9 @@
 # gradle-msbuild-plugin changelog
 
+## 2.21
+### Fixed
+* Use msbuild on Lininx if available
+
 ## 2.20
 ### Fixed
 * Resolving msbuild failure when msbuild version has been defined in build script
@@ -10,7 +14,7 @@
 * added support for updating assembly info for `VB.Net` projects in AssemblyInfo.vb files.
 
 ### Changed
-* changed the `AssemblyInfoVersionPatcher` so that it will not overwrite values in the AssemblyInfo files if the value being set is blank.  
+* changed the `AssemblyInfoVersionPatcher` so that it will not overwrite values in the AssemblyInfo files if the value being set is blank.
 * changed NuGet.exe dependency from `2.8.6` to version `4.4.0`
 * support resolving projects for ToolsVersion `15.0`
 * minimum required .Net Framework version for now is `v4.6`