Update README.md

Author: anna-grim

README.md

@@ -14,7 +14,7 @@ GraphTrace is a Python library that leverages machine learning to automatically
 <p>
   <img src="imgs/result.png" width="900" alt="">
   <br>
-   <b> Figure: </b>Split correction result obtained with GraphTrace
+   <b> Figure: </b>Neuron segmentation fragments corrected using GraphTrace.
 </p>
 
 Briefly describe inference pipeline, to do...