MOD: Updated README

Author: madduci

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/madduci/docker-linux-cpp.svg?branch=master)](https://travis-ci.org/madduci/docker-linux-cpp)
 
-A basic docker image for C++ developers, featuring g++ (from 4.9 up to 7.x) and clang++ (from 3.8 to 5.0) and CMake support. The default compiler is g++ 7, but you're free to modify the Dockerfile and set your own; as example, if you want to set g++ 4.9 as the default compiler, just write the following Dockerfile and build a new image:
+A basic docker image for C++ developers, featuring g++ (from 4.9 up to 7.x) and clang++ (from 3.8 to 6.0) and CMake support. The default compiler is g++ 7, but you're free to modify the Dockerfile and set your own; as example, if you want to set g++ 4.9 as the default compiler, just write the following Dockerfile and build a new image:
 
 ```
 # Dockerfile