Prepare 1.2.0 release (#1585)* Sync zh and zh-hant versions* Update the list of contributors.* Update time_complexity_simple_example.png* Reduce size of the RGBA images for zh-hant version.* Sync the zh-hant version of terminology.md* Prepare 1.2.0 release* Update the contributors list.

Prepare 1.1.0 release (#1274)* Update bucket_sort.c* Fix the comments in quick_sort.c* Update the announce badge* Sync zh and zh-hant versions* Update contributors list.* Sync zh and zh-hant versions.* Sync zh and zh-hant versions.* Update the contributors list* Update the version number

Prepare 1.0.0 release (#1044)* Update the book with the thrid revised edition* Fix a typo* Update the contributors' information* Update the mindmap* Update the version number

Prepare 1.0.0b6 release.

prepare 1.0.0b5 release

Prepare 1.0.0b4 release.

Prepare 1.0.0b3 release.

Prepare 1.0.0b2 release

Update the chapter preface.