message: Fixing README
  Closes
diff: @@ -49,7 +49,9 @@ Tantivy is, in fact, strongly inspired by Lucene's design.
  # Non-features
  -- Distributed search is out of the scope of tantivy.
  +- Distributed search is out of the scope of tantivy. That being said, tantivy is meant as a
  +library upon which one could build a distributed search. Serializable/mergeable collector state for instance,
  +are within the scope of tantivy.
  # Supported OS and compiler
  