Can't export images v1.0.1

[arsic3]

Hello, I'm currently using matplot++ v1.0.1 for my own project. I followed this tutorial on how to export images.

Below I provide you code snippet I'm using for basic plot:

` int main() {
using namespace matplot;

auto f = figure(true);

plot({0, 1, 2, 3}, {0, 1, 2, 3});

save("./img/graph", "png");

return 0;

}`

Sadly nothing happens. The folder "img" gets created, but the graph.png (or any other exstension is not created).
My version gnuplot is 5.4 patchlevel 5 inside of msys2 environment.

Are there maybe any known issues with this version of matplot++? I've seen a similar discussion on the subject but the person who submitted the problem apparently did not look into correct directory. Here, I'm pretty sure I'm doing all that is needed to export basic graph to the known location.