Notable changes:

• Corrected LibreSSL compilation issue
  
• Removed use of asio::socket::close due to segmentation fault when Config::thread_pool_size was larger than 1
  
• Added support for TCP Fast Open in server when using Linux
  
• Server now supports IPv6 connections when Config::address is empty
  
• Tests now perform checks in CMake's Release build
  
• Both new and old Asio API now supported
  
• SimpleWeb::status_code() now only regards the status code number when searching for status code enum, and can also return undefined enums that can be cast to an integer value
  
• set_timeout() no longer keeps connections alive longer than necessary
  
• Client's response object is now reset when attempting to resend request after error
  
• Now correctly erase connection from connections list when a connection should be closed
  
• Added support for server-sent events on client requests
  
• Added support for non-standard line endings in response status and header on client requests
  
• Made use of Clang Thread Safety Analysis
  
• Added CMake option to build without OpenSSL
  
• CI now additionally runs tests on several older Debian stable versions as well as on Arch Linux