update changelog

CHANGELOG.md

@@ -8,6 +8,8 @@ Unreleased
   - Converting a `time::OffsetDateTime` to `Value::Date` implicitly converts the value into UTC.
     If this is not desired do the time zone conversion yourself and use `time::PrimitiveDateTime`
     directly instead.
+- Add [histogram](https://github.com/quickwit-oss/tantivy/pull/1306) aggregation (@PSeitz).
+- Add support for fastfield on text fields (@PSeitz).
 
 Tantivy 0.17
 ================================
@@ -19,7 +21,7 @@ Tantivy 0.17
 - Schema now offers not indexing fieldnorms (@lpouget) [#922](https://github.com/quickwit-oss/tantivy/issues/922)
 - Reduce the number of fsync calls [#1225](https://github.com/quickwit-oss/tantivy/issues/1225)
 - Fix opening bytes index with dynamic codec (@PSeitz) [#1278](https://github.com/quickwit-oss/tantivy/issues/1278)
-- Added an aggregation collector compatible with Elasticsearch (@PSeitz)
+- Added an aggregation collector for range, average and stats compatible with Elasticsearch. (@PSeitz)
 - Added a JSON schema type @fulmicoton [#1251](https://github.com/quickwit-oss/tantivy/issues/1251)
 - Added support for slop in phrase queries @halvorboe [#1068](https://github.com/quickwit-oss/tantivy/issues/1068)