Update the README for a full release of 4.5.8

Author: AngledLuffa

doc/corenlp/README.txt

@@ -41,8 +41,12 @@ LICENSE
 CHANGES
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-2024-05-17    4.5.8     Update paths to reflect an internal file
-                        server dying
+2024-12-11    4.5.8     Update paths to reflect an internal file 
+                        server dying.  Add brat demo files to distrib 
+                        to reduce dependencies on nlp.stanford.edu.  
+                        Update the con->dep converter for UD.  Update 
+                        some external libraries for security 
+                        vulnerabilities
 
 2024-04-18    4.5.7     Add the f1 scores to the parser output,
                         improve the dependency converter