revert a TODO task

actually, there is only structural checks on the config to make
sure the record has a good shape but there is no further check, e.g.
making sure two bindings do not collide.

README.md

@@ -177,7 +177,7 @@ in order to help, you can have a look at
 - [x] give different colors to names and type
 - [x] show true tables as such
 - [ ] get the config from `$env.config` => can parse configuration from CLI
-- [x] add check for the config to make sure it's valid
+- [ ] add check for the config to make sure it's valid
 - [ ] support for editing cells in INSERT mode
   - [x] string cells
   - [ ] other simple cells