Include stb_image as a submodule instead of a file in the repository

Instead of storing a copy of stb_image.h in the repository directly,
we can just include it as a submodule.

1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index b30d1e0..1c5c765 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ It is recommended that you create a ``build`` directory for CMake to generate bu
 ```sh
 git clone https://github.com/cflip/Nonortho
 cd Nonortho
+git submodule update
 mkdir build && cd build
 cmake ../
 ```