v2.4.0

* Proofreading
* New subsections
  * Why This Book
  * The Audience for this Book
  * What You Will Learn
* New section "Final Notes"

v2.3.1

* Proofreading

v2.3.0

* building system based on Docker
* new distributable format `docx` (Issue#52)

v2.2.1

* fix broken links

v2.2.0

* Cryptographic Practices updated
  * BLAKE2 details
  * BLAKE2 source code sample
* New section: Regular Expressions

v2.1.0

* improved Logging subsection
* new General Coding Practices > CSRF section

License update to CC-BY-SA 4.0