Add changelog entry

CHANGELOG.md

@@ -1,3 +1,16 @@
+## dbt 1.0.0 (Release TBD)
+
+### Breaking changes
+
+- The two type of test definitions are now "singular" and "generic" (instead of "data" and "schema", respectively). The `test_type:` selection method accepts `test_type:singular` and `test_type:generic`. (It will also accept `test_type:schema` and `test_type:data` for backwards compatibility) ([#3234](https://github.com/dbt-labs/dbt/issues/3234), [#3880](https://github.com/dbt-labs/dbt/pull/3880)). **Breaking:** The `--data` and `--schema` flags to `dbt test` are no longer supported, and tests no longer have the tags `'data'` and `'schema'` automatically applied ([#3880](https://github.com/dbt-labs/dbt/pull/3880)).
+
+### Features
+- Normalize global CLI arguments/flags ([#2990](https://github.com/dbt-labs/dbt/issues/2990), [#3839](https://github.com/dbt-labs/dbt/pull/3839))
+
+### Fixes
+
+- Add generic tests defined on sources to the manifest once, not twice ([#3347](https://github.com/dbt-labs/dbt/issues/3347), [#3880](https://github.com/dbt-labs/dbt/pull/3880))
+
 ## dbt 0.21.0 (Release TBD)
 
 ## dbt 0.21.0b2 (August 19, 2021)
@@ -17,7 +30,6 @@
 - Added timing and thread information to sources.json artifact ([#3804](https://github.com/dbt-labs/dbt/issues/3804), [#3894](https://github.com/dbt-labs/dbt/pull/3894))
 - Update cli and rpc flags for the `build` task to align with other commands (`--resource-type`, `--store-failures`) ([#3596](https://github.com/dbt-labs/dbt/issues/3596), [#3884](https://github.com/dbt-labs/dbt/pull/3884))
 - Log tests that are not indirectly selected. Add `--greedy` flag to `test`, `list`, `build` and `greedy` property in yaml selectors ([#3723](https://github.com/dbt-labs/dbt/pull/3723), [#3833](https://github.com/dbt-labs/dbt/pull/3833))
-- Normalize global CLI arguments/flags ([#2990](https://github.com/dbt-labs/dbt/issues/2990), [#3839](https://github.com/dbt-labs/dbt/pull/3839))
 
 ### Fixes