Update README.md

Author: yuanzhou

src/hubmap_translation/addl_index_transformations/portal/README.md

@@ -1,5 +1,2 @@
 This directory provides code that cleans and reorganizes HuBMAP documents
 before they go to the `portal` Elasticsearch index.
-
-(I would be very happy if there were tests and linting across this whole repo, but for now this directory is a kingdom unto itself.
-There is `.travis.yml` at the top level, but otherwise this is self-contained.)