NanoMQ v0.3.8 Release Note

Add a Command-line toolkit for NanoMQ broker, so that users can tune NanoMQ broker according to a different platform (1. Altering the numbers of Threads(taskq) (2. Altering the numbers of Parallel context. (3. Altering the length of msg queue. (4. Set daemon booting mode. Add configuration file for NanoMQ. The effect is as same as the command-line toolkit. Modify docker file, user can pass arguments via command line to the container.