v1.3

Completely rewrite memory ordering for read file implementation based on spin locks:

• add missing std::atomic
• make more operations with std::memory_order_relaxed
• no need in separate memory bariers any more

Also updated code and documentation to remove erroneous mention of lock-free implementation.

v1.2

This release is the first who provides two platform executables: x86 and x64

v1.1

• added CI: building project with MSVC 2019 and running unit tests for:
  • Debug-Win32
  • Debug-x64
  • Release-Win32
  • Release-x64