chore: added release notes for 1.4

RELEASING/release-notes-1-4/README.md

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+
+# Release Notes for Superset 1.4
+
+Superset 1.4 focuses heavily on continuing to polish the core Superset experience. This release has a very very long list of fixes from across the community.
+
+- [**User Experience**](#user-facing-features)
+- [**Database Experience**](#database-experience)
+- [**Breaking Changes and Full Changelog**](#breaking-changes-and-full-changelog)
+
+## User Facing Features
+
+- Charts and dashboards in Superset can now be certified! In addition, the Edit Dataset modal more accurately reflects state of Certification (especially for Calculated Columns). ([#17335](https://github.com/apache/superset/pull/17335), [#16454](https://github.com/apache/superset/pull/16454))
+
+![Tab Column](media/calc.png)
+
+- Parquet files can now be uploaded into an existing connected database that has Data Upload enabled. Eventually, the contributor hopes that this foundation can be used to accommodate `feather` and `orc` files. ([#14449](https://github.com/apache/superset/pull/14449))
+
+- Tabs can now be added to Column elements in dashboards. ([#16593](https://github.com/apache/superset/pull/16593))
+
+![Tab Column](media/tab_column.jpg)
+
+- The experience of using alerts and reports have improved in a few minor ways. ([#16335](https://github.com/apache/superset/pull/16335),[#16281](https://github.com/apache/superset/pull/16281))
+
+- Drag and drop now has a clickable ghhost button for an improved user experience. ([#16119](https://github.com/apache/superset/pull/16119))
+
+## Database Experience
+
+- Apache Drill: Superset can now connect to Apache Drill (thru ODBC / JDBC) and impersonate the currently logged in user. ([#17353](https://github.com/apache/superset/pull/17353/files)).
+
+- Firebolt: Superset now supports the cloud data warehouse Firebolt! ([#16903](https://github.com/apache/superset/pull/16903)).
+
+- Databricks: Superset now supports the new [SQL Endpoints in Databricks](https://docs.databricks.com/sql/admin/sql-endpoints.html). ([#16862](https://github.com/apache/superset/pull/16862))
+
+- Apache Druid: Superset Explore now can take advantage of support for JOIN's in Druid (note: the `DRUID_JOINS` feature flag needs to be enabled). ([#16770](https://github.com/apache/superset/pull/16770))
+
+- AWS Aurora: Superset now has a separate db_engine_spec for Amazon Aurora. ([#16535](https://github.com/apache/superset/pull/16535))
+
+- Clickhouse: Superset now includes function names in the auto-complete for SQL Lab. ([#16234](https://github.com/apache/superset/pull/16234))
+
+- Google Sheets: Better support for private Google Sheets was added. ([#16228](https://github.com/apache/superset/pull/16628))
+
+
+## Developer Experience
+
+- The `Makefile` for Superset has gone through a number of improvements. ([#16327](https://github.com/apache/superset/pull/16327), [#16533](https://github.com/apache/superset/pull/16533))
+
+- Add Python instrumentation to pages, showing method calls used to build the page & how long each one took. This requires a configuration flag (see PR for more info). ([#16136](https://github.com/apache/superset/pull/16136))
+
+![Pyinstrument](media/pyinstrument.png)
+
+## Breaking Changes and Full Changelog
+
+**Breaking Changes**
+
+- [16660](https://github.com/apache/superset/pull/16660): The `columns` Jinja parameter has been renamed `table_columns` to make the columns query object parameter available in the Jinja context.
+- [16711](https://github.com/apache/superset/pull/16711): The url_param Jinja function will now by default escape the result. For instance, the value `O'Brien` will now be changed to `O''Brien`. To disable this behavior, call `url_param` with `escape_result` set to `False: url_param("my_key", "my default", escape_result=False)`.
+
+**Changelog**
+
+To see the complete changelog in this release, head to [CHANGELOG.MD](https://github.com/apache/superset/blob/master/CHANGELOG.md). As mentioned earlier, this release has a MASSIVE amount of bug fixes. The full changelog lists all of them!