Releasing v5.6.1

Includes minor performance optimizations

Author: ENikS

package.props

@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <Version>5.6.0</Version>
+    <Version>5.6.1</Version>
     <PackageReleaseNotes>This package is distributed as .NET Standard 1.0, .NET 4.0, 4.5, 4.7 package.</PackageReleaseNotes>
   </PropertyGroup>