Updated changelog

Author: Nils Reiter

Diff for: CHANGELOG.md

@@ -12,6 +12,7 @@ https://github.com/nilsreiter/CorefAnnotator/issues
 - Export mention statistics now has some configuration options. 
   Import and export plugins can have that as well now. #76
 - Sorting of entities in the tree is now case insensitive #257
+- Shortcut keys are now displayed in brackets #256
 - We can now specify a profile when loading the application #249. 
   The profile is stored in an XML file called `profile.xml` in the same
   directory as the XMI file to be loaded. The profile can