Hocon.Configuration 1.2.1

HOCON 1.2.1 contains many minor bug fixes and behavioral changes. Default HOCON loading order** Per [issue 151](https://github.com/akkadotnet/HOCON/issues/151), `HOCON.Configuration` now looks for default HOCON content in the following places in the following order: 1. [.NET Core / .NET Framework] An "app.conf" or an "app.hocon" file in the current working directory of the executable when it loads; 2. [.NET Framework] - the `<hocon>` `ConfigurationSection` inside `App.config` or `Web.config`; or 3. [.NET Framework] - and a legacy option, to load the old `<akka>` HOCON section for backwards compatibility purposes with all users who have been using HOCON with Akka.NET. Bug fixes**: For a set of complete bug fixes and changes, please see [the HOCON v1.2.1 milestone on Github](https://github.com/akkadotnet/HOCON/milestone/2).