[mac] Compiler warning - braces around scalar initializer about procfetch

[youpong]

This can be reproduced on ubuntu by specifying clang++ as the compiler as follows.

$ CXX=clang++ make clean all
make -C src clean all
make[1]: Entering directory '/home/nakajimay/git/cpp/procfetch/src'
rm procfetch fetch.o
clang++-14 -std=c++2a -Wall --pedantic-errors   -c -o fetch.o fetch.cpp
fetch.cpp:575:28: warning: braces around scalar initializer [-Wbraced-scalar-init]
    ascii_arts["Ubuntu"] = {"ubuntu.ascii"};
                           ^~~~~~~~~~~~~~~~

[TanmayPatil105]

Actually, the code doesn't run properly run on MacOS due to clang c++ installed by default and also the filesystem is quite different.
Take a look at #23

[TanmayPatil105]

Screenshot for reference :