update readme

Author: Sandoun

README.md

@@ -52,7 +52,7 @@ Where is the RS232/Serial support?
 
 Install this package by using [Nuget](https://www.nuget.org/packages/Mewtocol.NET) or reference 
 ```XML
-<PackageReference Include="Mewtocol.NET" Version="0.6.2"/>
+<PackageReference Include="Mewtocol.NET" Version="0.7.0"/>
 ```
 in your dependencies.
 Alternatively use the dotnet CLI and run