Updated README

README.md

@@ -5,7 +5,7 @@ cpp-httplib
 [![Build Status](https://travis-ci.org/yhirose/cpp-httplib.svg?branch=master)](https://travis-ci.org/yhirose/cpp-httplib)
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-A C++ single-file header-only cross platform HTTP/HTTPS library.
+A C++11 single-file header-only cross platform HTTP/HTTPS library.
 
 It's extremely easy to setup. Just include **httplib.h** file in your code!