Update README.md

Author: Bercon

README.md

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 The SDK performs 6-DoF pose tracking based on visual-inertial odometry (VIO), the fusion of camera and IMU data.
 
-# Download
+## Download
 
 The SDK is available for Luxonis OAK-D device family for Python with `pip install spectacularai`. For Intel RealSense D455 & D435i you can download the C++ plugin from the Releases on the right.