message: docs: change log updated
diff: +## Oct 14, 2018
  +
  +Xunbin, Su adds the function of shutdowning the `ghttp` server. In addition, he addes the `ginit` command to system and prepares the nodejs API.
  +What is more, `drop` command is supported in `ghttp` by Xunbin, Su.
  +
  +Chaofan, Yang fixes the bug in the encoder part of `ghttp` api.
  +
  +Li, Zeng fixes bugs in build process and in the indices module, addes some scripts for demo.
  +
  +Yinnian, Lin finds a way to scale the contributions of all developers and Li, Zeng adds this function in Makefile.
  +
  +Yuyan, Chen addes help document to the system, both in Chinese and English.
  +
  +Jing, Li uses JSON format in response to the request of clients, and addes `system.db` to store information of multiple users.
  +
  +Wenjie, Li reviews the code of gStore system, and proposes many feasible suggestions for optimization. We have made a plan to optimize the system in all aspects and all effects of the plans will be seen in the next release version.
  +When the version of release rises to 1.0.0, and that is the time we will call the system a formal release rather than a pre-release.
  +
  +---
  +
  ## Sep 20, 2018
  Zongyue, Qin fixes the remaining bugs in Trie, ISArray and IVArray.
  