Update README.md

Author: abdallahdib

README.md

@@ -14,6 +14,7 @@ NextFace is a light-weight pytorch library for high-fidelity 3D face reconstruct
 
 
 # News 
+* ** 19 March 2023**: fixed a bug in the optimizer where the gradients whare not activated for the camera pos (rotation and translation). Also I added a new optimization strategy for the second and third stage which should improve the overall performance. plz pull
 * **21 June 2022**: Many thanks for **[Jack Saunders](https://researchportal.bath.ac.uk/en/persons/jack-saunders)** for adding this new feature to NextFace: Added support for [mediapipe](https://google.github.io/mediapipe/solutions/face_mesh.html#overview) as a replacement for FAN landmarks detector. Mediapipe produces much stable and accurate results than FAN . To try mediapipe, you need to pull the new version of the code and install mediapipe ** pip install mediapipe** . Now by default the landmarks detector used is mediapipe, if you want to switch bach to FAN plz edit the **optimConfig.ini** file (set **lamdmarksDetectorType = 'fan'**)
 * **01 May 2022**: i you want to generate an animation like the one of the gif files in the readme that rotates the reconstruction on the vertical axis, plz run the replay.py script and give it the path of the pickle file that contains the optimized scene attributes ( located in  checkpoints/stage3_output.pickle). 
 * **26 April 2022**: I added export of the estimated light map (as an environment map). this can be useful if you want to render the face with other rendering engines (Unreal, Unity, OpenGL). plz pull the code. U can choose to export the lightmap as png or exr (check optimConfig.ini)