fix(Readme): bump package reference version (#12)

Author: m31coding

README.md

@@ -25,7 +25,7 @@ PM> Install-Package M31.FluentApi
 A package reference will be added to your `csproj` file. Moreover, since this library provides code via source code generation, consumers of your project don't need the reference to `M31.FluentApi`. Therefore, it is recommended to use the `PrivateAssets` metadata tag:
 
 ```xml
-<PackageReference Include="M31.FluentApi" Version="1.1.0" PrivateAssets="all"/>
+<PackageReference Include="M31.FluentApi" Version="1.2.0" PrivateAssets="all"/>
 ```
 
 If you would like to examine the generated code, you may emit it by adding the following lines to your `csproj` file: