Update README.md

Author: mgxd

README.md

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-*NiBabies* is an extension of [fMRIPrep](https://fmriprep.org/en/stable/) designed and tested for infants 0-2 years old. *NiBabies* offers structural (and soon, functional) MRI preprocessing.
+*NiBabies* is an extension of [fMRIPrep](https://fmriprep.org/en/stable/) designed and tested for infants 0-2 years old. *NiBabies* offers structural and functional MRI preprocessing.