fix the broken link

README.md

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 `SeqIKPy` is a Python package that provides an implementation of inverse kinematics (IK) that is based on the open-source Python package [IKPy](https://github.com/Phylliade/ikpy). In constrast to the current IK approaches that aims to match only the end-effector, `SeqIKPy` is designed to calculate the joint angles of the fly body parts to align the 3D pose of the entire kinematic chain to a desired 3D pose. In particular, you can use `SeqIKPy` in the pipeline shown below.
 
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-<img src="https://github.com/NeLy-EPFL/sequential-inverse-kinematics/blob/e10f700ef9dd925b49cb98858763225e3d64bc7b/docs/images/pipeline.png" width="95%">
+<img src="https://github.com/NeLy-EPFL/sequential-inverse-kinematics/blob/a6ec5560825f4d5570dc2f61c9e07fd6e2fbb8d7/docs/images/pipeline.png" width="95%">
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