Update README.md

Author: fussegli

README.md

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 # MATBOX: Microstructure Analysis Toolbox
 **MATLAB open source microstructure analysis code embedded with a graphic user interface**\
 *v0.91 March 18, 2021*\
- See release_notes.txt for a change log.
+See release_notes.txt for a change log.
 
 ## What is MATBOX?
 MATBOX is a MATLAB application for performing various microstructure-related tasks including **microstructure numerical generation**, **image filtering** and **microstructure segmentation**, **microstructure characterization**, **three-dimensional visualization**, **result correlation**, and **microstructure meshing**. \