Comment to use release build so that it becomes _way_ faster

README.md

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+# Viola-Jones' Haarcascade visualisation
+
+This is an unusual visualisation of haarcascades. Often, only haarcascade features are drawn. This visualisation however, adds up all matching features in an image. Resulting in a sort of lense which shows the contrasts in the image that the algorithm picks up on most.
+
+* The visual_haarcascades binary ([main.rs](src/main.rs)) uses V4L to capture webcam input and renders to a canvas.
+* [test.rs](src/test.rs) binary is an ugly program that looks hard-coded for `haarcascade_frontalface_alt2.xml` and `test.png`. It renders the output to `test-output.png`.
+* The library is made for use with eg. Python through cffi. See eg. [this repo](https://git.rubenvandeven.com/r/face_recognition) 
+
+## build
+
+Most importantly
+
+```bash
+cargo build --lib --release
+```