Update documentation

src/main.cpp

@@ -42,7 +42,6 @@ std::vector<CellMap> vector_cellmap(HeightMap* heightmap, int interval)
         for (int i = 1; i <= num_contours; i++) 
         {
             vec_private.push_back(produce_cellmap(heightmap, heightmap->min + interval*i));
-            std::cout << "Execute thread " << omp_get_num_threads() << " ";
         }
         #pragma omp critical
         vector_contours.insert(vector_contours.end(), vec_private.begin(), vec_private.end());