0.22.1

• Added an additional way of gracefully triggering shutdown of a running service, by using the new tomodachi.exit() function, which will initiate the termination processing flow in the same way as signaling SIGINT or SIGTERM. The tomodachi.exit() call can additionally take an optional exit code as an argument to support new ways of catching service operation.
• The process' exit code can also be altered by changing the value of tomodachi.SERVICE_EXIT_CODE, however using the new tomodachi.exit call with an integer argument will override any previous value set to tomodachi.SERVICE_EXIT_CODE. The default value is set to 0.