Update README.md

michaeltroger · Feb 8, 2024 · 9684e2e · 9684e2e
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-# Augmented Reality simple shape detector using OpenCV
+# Augmented Reality simple shape detector using OpenCV 4
 [![Android CI](https://github.com/michaeltroger/shape-detection-android/actions/workflows/android.yml/badge.svg)](https://github.com/michaeltroger/shape-detection-android/actions/workflows/android.yml)
 
 Attention: This app was created in 2016. I was a beginner to Android development and Computer Vision back then.
 So don't expect a perfect code please. Over the years I updated the dependencies and converted it to Kotlin, while the business logic remained unchanged.
 
+Note: Originally I targeted min SDK 15 and OpenCV 3 with this project, nowadays the repo uses newer versions. If the old versions is something that you need, then you can look back in the repo's Git history (app version 1.2)
+
 <img src="/screenshots/demo.gif" alt="Augmented Reality shape detection" width="800px"/>
 
 ### What is this repository for? ###