readme: update description of -T flag

Author: practicalli-johnny

README.md

@@ -23,7 +23,7 @@ Aliases are defined to be used with all execution options `-A`, `-M`, `-P`, `-T`
 
 * `-M` for `:main-opts` configuration
 * `-X` for `:exec-opts` configuration
-* `-T` for `:exec-opts`, ignoring project dependencies
+* `-T` for `:exec-opts`, ignoring project dependencies and only root of project as class path
 
 > [Clojure CLI - Which execution options to use](https://practical.li/clojure/clojure-cli/execution-options/)