add tests/docs for Ubuntu 20.04

gcontini

2020-10-11 34c994011ba790167c2ffa8a9f7da78e38236147

 src/library/os/linux/execution_environment.cpp

@@ -18,7 +18,7 @@
#include "../cpu_info.hpp"
#include "../execution_environment.hpp"
#include "../../base/file_utils.hpp"
#include "../../base/StringUtils.h"
#include "../../base/string_utils.h"

namespace license {
namespace os {