docs: replace done features for features

all features that were planned to be implemented are done, so there is not necessary to have a done feature any longer

Author: matmatias

README.md

@@ -40,8 +40,6 @@ This might be necessary to get code completion/snippets.
 
 ## Features
 
-### Done
-
 The following features are done:
 
 1. Add new tasks