2019-11-02 version 2.2:

Change internal send mode from synchronous to asynchronous.

2019-06-28 version 2.1:

Fixed some bugs.

2019-06-04 version 2.0:

[BIG Update!!!]
Rewrite all code with template metaprogramming mode.
Version 1.x code will no longer be maintained.

2018-04-12 version 1.4:

Fixed some bugs in session_mgr_t class.
Adjust some other code.

2018-01-24 version 1.3:

Replace boost::asio with asio standalone to avoid conflicts when use boost and asio2 at the same time.
Adjust and optimize some other code.

2018-01-06 version 1.2:

fixed bug : sender and session has't post close notify to listener when closed.
Redesign the sender code.

2018-01-02 version 1.1:

Upgrade the boost (asio) version to 1.66.0
Changed the parameters of the listening interface to reference
Modified the SSL certificate setting function, many functions need to be invoked before, now only one function needs to be called
Optimizes a lot of internal code

2017-10-27 version 1.0:

Initial release.