update changelog and migration guide for release 20.03.0 (#4456)

CHANGELOG.md

@@ -7,7 +7,27 @@ and this project adheres to [Calendar Versioning](http://calver.org/) `0Y.0M.MIC
 For upgrade instructions, please check the [migration guide](MIGRATIONS.md).
 
 ## Unreleased
-[Commits](https://github.com/scalableminds/webknossos/compare/20.02.0...HEAD)
+[Commits](https://github.com/scalableminds/webknossos/compare/20.03.0...HEAD)
+
+### Added
+-
+
+### Changed
+-
+
+### Fixed
+-
+
+### Removed
+-
+
+
+## [20.03.0](https://github.com/scalableminds/webknossos/releases/tag/20.03.0) - 2020-02-27
+[Commits](https://github.com/scalableminds/webknossos/compare/20.02.0...20.03.0)
+
+### Highlights
+- Added support for datasets with more layers than the hardware can render simultaneously. The user can disable layers temporarily to control for which layers the GPU resources should be used. [#4424](https://github.com/scalableminds/webknossos/pull/4424)
+- Time tracking precision is improved. [#4445](https://github.com/scalableminds/webknossos/pull/4445)
 
 ### Added
 - Added support for datasets with more layers than the hardware can render simultaneously. The user can disable layers temporarily to control for which layers the GPU resources should be used. [#4424](https://github.com/scalableminds/webknossos/pull/4424)

MIGRATIONS.md

@@ -10,6 +10,9 @@ User-facing changes are documented in the [changelog](CHANGELOG.md).
 ### Postgres Evolutions:
 -
 
+## [20.03.0](https://github.com/scalableminds/webknossos/releases/tag/20.03.0) - 2020-02-27
+No migrations necessary.
+
 ## [20.2.0](https://github.com/scalableminds/webknossos/releases/tag/20.2.0) - 2020-01-27
 ### Postgres Evolutions:
 - [050-add-annotation-visibility-enum.sql](conf/evolutions/050-add-annotation-visibility-enum.sql)