Update README.md

In order to use basic_logger_mt an additional include is required.
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Martin Krammer 2019-04-06 11:17:11 +02:00 committed by GitHub
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@ -79,6 +79,8 @@ async... Elapsed: 0.349851 2,858,358/sec
#### Basic usage
```c++
#include "spdlog/spdlog.h"
#include "spdlog/sinks/basic_file_sink.h"
int main()
{
spdlog::info("Welcome to spdlog!");