docs: Increase version to 1.21.0

Author: JanEbbing

Diff for: CHANGELOG.md

@@ -5,7 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## Unreleased
+## [1.21.0] - 2025-01-15
 ### Added
 * Added support for the Write API in the client library, the implementation
   can be found in the `DeepLClient` class. Please refer to the README for usage
@@ -325,7 +325,7 @@ Version increased to avoid conflicts with old packages on PyPI.
 Initial version.
 
 
-[Unreleased]: https://github.com/DeepLcom/deepl-python/compare/v1.20.0...HEAD
+[1.21.0]: https://github.com/DeepLcom/deepl-python/compare/v1.20.0...v1.21.0
 [1.20.0]: https://github.com/DeepLcom/deepl-python/compare/v1.19.1...v1.20.0
 [1.19.1]: https://github.com/DeepLcom/deepl-python/compare/v1.19.0...v1.19.1
 [1.19.0]: https://github.com/DeepLcom/deepl-python/compare/v1.18.0...v1.19.0

Diff for: deepl/version.py

@@ -2,4 +2,4 @@
 # Use of this source code is governed by an MIT
 # license that can be found in the LICENSE file.
 
-VERSION = "1.20.0"
+VERSION = "1.21.0"

Diff for: pyproject.toml

@@ -3,7 +3,7 @@ line-length = 79
 
 [tool.poetry]
 name = "deepl"
-version = "1.20.0"
+version = "1.21.0"
 description = "Python library for the DeepL API."
 authors = ["DeepL SE <[email protected]>"]
 license = "MIT"

Diff for: tests/test_general.py

@@ -17,7 +17,7 @@
 
 
 def test_version():
-    assert "1.20.0" == deepl.__version__
+    assert "1.21.0" == deepl.__version__
 
 
 @pytest.mark.parametrize(