docs(README): automatic update (#116)

Update README Android
  [This list might not be relevant]
  refact: Remove redundant conditions
Search cache is now available on Android
refact: Use `frontend?` convenience function instead of listing languages [ci skip]

Author: algoliareadmebot

README.md

@@ -44,6 +44,7 @@ Search
 
 1. [Search in an index](#search-in-an-index---searchasync)
 1. [Find by IDs](#find-by-ids---getobjectsasync)
+1. [Search cache](#search-cache)
 
 Indexing