Update README.md

Author: alejandrofsevilla

README.md

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 Asynchronous [Boost.Asio](https://www.boost.org/doc/libs/1_74_0/doc/html/boost_asio.html) TCP server and client example. 
 
 ## Requirements
-- C++17
+- C++17 compiler
 - CMake 3.22.0
 - Boost 1.74.0
 - GoogleTest 1.11.0