add changelog entry

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Fix incorrect error message when a selector does not match any node [#3036](https://github.com/fishtown-analytics/dbt/issues/3036))
 - Fix variable `_dbt_max_partition` declaration and initialization for BigQuery incremental models ([#2940](https://github.com/fishtown-analytics/dbt/issues/2940), [#2976](https://github.com/fishtown-analytics/dbt/pull/2976))
 - Moving from 'master' to 'HEAD' default branch in git ([#3057](https://github.com/fishtown-analytics/dbt/issues/3057), [#3104](https://github.com/fishtown-analytics/dbt/issues/3104), [#3117](https://github.com/fishtown-analytics/dbt/issues/3117)))
+- Requirement on `dataclasses` is relaxed to be between `>=0.6,<0.9` allowing dbt to cohabit with other libraries which required higher versions. ([#3150](https://github.com/fishtown-analytics/dbt/issues/3150), [#3151](https://github.com/fishtown-analytics/dbt/pull/3151))
 
 ### Features
 - Add optional configs for `require_partition_filter` and `partition_expiration_days` in BigQuery ([#1843](https://github.com/fishtown-analytics/dbt/issues/1843), [#2928](https://github.com/fishtown-analytics/dbt/pull/2928))
@@ -23,6 +24,7 @@ Contributors:
 - [ran-eh](https://github.com/ran-eh) ([#3036](https://github.com/fishtown-analytics/dbt/pull/3036))
 - [@pcasteran](https://github.com/pcasteran) ([#2976](https://github.com/fishtown-analytics/dbt/pull/2976))
 - [@VasiliiSurov](https://github.com/VasiliiSurov) ([#3104](https://github.com/fishtown-analytics/dbt/pull/3104))
+- [@bastienboutonnet](https://github.com/bastienboutonnet) ([#3151](https://github.com/fishtown-analytics/dbt/pull/3151))
 
 ## dbt 0.19.1 (Release TBD)