Merge pull request #969 from mborland/readme

Update README

Author: mborland

README.md

@@ -2,8 +2,7 @@ Boost Math Library
 [![Build Status](https://drone.cpp.al/api/badges/boostorg/math/status.svg)](https://drone.cpp.al/boostorg/math)[![Build Status](https://github.com/boostorg/math/workflows/CI/badge.svg?branch=develop)](https://github.com/boostorg/math/actions)
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->ANNOUNCEMENT: Support for C++11 will be deprecated in this library starting in July 2023 (Boost 1.82).  
->New features will require *at least* C++14, as will existing features starting with the deprecation release.
+>ANNOUNCEMENT: This library now requires a compliant C++14 compiler.
 
 This library is divided into several interconnected parts: