Update README.md to clearly state v6 will take bug and security fixes onlyl

Co-authored-by: Jeremy Tuloup <jeremy.tuloup@gmail.com>

README.md

@@ -16,7 +16,7 @@ The Jupyter Notebook project is currently undertaking a transition to a more mod
 
 There is new stream of work which was submitted and then accepted as a Jupyter Enhancement Proposal (JEP) as part of the next version (v7): https://jupyter.org/enhancement-proposals/79-notebook-v7/notebook-v7.html
 
-There is also a plan to move forward the current version (v6): https://github.com/jupyter/notebook-team-compass/issues/5#issuecomment-1085254000
+There is also a plan to continue maintaining Notebook v6 with bug and security fixes only, to ease the transition to Notebook v7: https://github.com/jupyter/notebook-team-compass/issues/5#issuecomment-1085254000
 
 #### Notebook v7