doc: update TODO

TODO.md

@@ -1,4 +1,5 @@
 # Todo
 
 - Use "source" and "sink" to explicitly represent the input and output of job to replace current circumstance that use explicit job name to declare dependencies. After this change, the dependency network will be automaticlaly calculated from "source" and "sink" relation.
+- Support analysing the license info for each output artifacts respectively.
 - Peel `assemblicon` off as an independent repository and let the builder of this repository refer it.