Fixes parsing of empty and null containing packets
The rcon lib from hamburghammer is a rework of james4k ones. It provides a better readable implementation.
This reduces the package size by ca. 50%. One draw back of this change is that there is no longer support for the `config.yml` file. There is also a change inside the env vars naming: The variables have to start with `RCON_CLI`.
ci: split CircleCI release into its own workflow docs: adding release instructions ci: Switch to Go modules
Augusto Dwenger J.
Geoff Bourne