Fix a typo

Author: ilijastuden

README.md

@@ -6,7 +6,7 @@ DatabaseObject library is a set of classes that make work with database just a b
 
 1. Types - entities that map to a single table,
 2. Objects - type instances that map to a single row of a type table,
-3. Collections - a group of objects that meet the given criteria. This group is perfect for HTTP responses because collections support data tagging and tag validation,
+3. Collections - a group of objects that meets the given criteria. This group is perfect for HTTP responses because collections support data tagging and tag validation (ETag and HTTP 304),
 4. Pool - manage registered types and make multi-type interaction possible,
 6. Producers - customise the way pool produces new instances,
 7. Validators - validate object properties before saving them to the database.