Version/Release notes set

Author: i4004

src/Simplify.System/Simplify.System.Sources.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
 	<metadata>
 		<id>Simplify.System.Sources</id>
-		<version>$version$</version>
+		<version>1.2.1</version>
 		<title>Simplify.System.Sources</title>
 		<authors>Alexander Krylkov</authors>
 		<owners>Alexander Krylkov</owners>
@@ -12,7 +12,9 @@
 		<description>Core classes for applications and libraries.</description>
 		<summary>Core classes for applications and libraries.</summary>
 		<releaseNotes>
-			+ ConfigurationException added
+			Breaking changes
+			* Nullable types enabled
+			* C# 8 features enabled
 		</releaseNotes>
 		<copyright>Licensed under LGPL</copyright>
 		<language>en-US</language>