changed ThreadPool header file extension to .hpp

Time to leave the past of C with objects and making a difference between these languages by using the appropriated C++ file extension

Author: Youka

ThreadPool.h ThreadPool.hppThreadPool.h renamed to ThreadPool.hpp

@@ -1,5 +1,5 @@
-#ifndef THREAD_POOL_H
-#define THREAD_POOL_H
+#ifndef THREAD_POOL_HPP
+#define THREAD_POOL_HPP
 
 #include <functional>
 #include <future>

example.cpp

@@ -2,7 +2,7 @@
 #include <vector>
 #include <chrono>
 
-#include "ThreadPool.h"
+#include "ThreadPool.hpp"
 
 int main()
 {