Update README.md

Author: anna-grim

README.md

@@ -43,8 +43,6 @@ Note: Misalignments between the ground truth graphs and prediction segmentation
 
 ### Step 2: Error Detection
 
-To do...
-
 <p>
   <img src="imgs/topological_mistakes.png" width="170" alt="Topological mistakes detected in skeleton">
   <br>
@@ -53,8 +51,6 @@ To do...
 
 ### Step 3: Compute Metrics
 
-To do...
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 - *\# Splits*: Number of connected components (minus 1) in a ground truth graph after removing omit nodes.
 - *\# Merges*: Number of ground truth graphs that contain at least one merge.
 - *Omit Edge Ratio*: Proportion of omitted edges.