Bump version to 0.4.0 and add corresponding changelog entry

Author: Paweł Kędzia

.version

@@ -1 +1 @@
-0.3.1
+0.4.0

CHANGELOG.md

@@ -14,4 +14,5 @@
 | 0.2.3   | New web configurator: Handling projects, configs for each user separately. First Available strategy is more powerful, a lot of improvements to efficiency.                                                                                                                                  |
 | 0.2.4   | Anonymizer module, integration anonymization with any endpoint (using dynamic payload analysis and full payload anonymisation), dedicated `/api/anonymize_text` endpoint as memory only anonymization. Whole router may be run in `FORCE_ANONYMISATION` mode.                               |
 | 0.3.0   | Anonymization available with three strategies: `fast_masker`, `genai`, `prov_masker`.                                                                                                                                                                                                       |
-| 0.3.1   | Refactoring `lb.strategies` to be more flexible modular. Introduced `MaskerPipeline` and `GuardrailPipeline` both configured via env. Removed genai-based masking endpoint.                                                                                                                 |
+| 0.3.1   | Refactoring `lb.strategies` to be more flexible modular. Introduced `MaskerPipeline` and `GuardrailPipeline` both configured via env. Removed genai-based masking endpoint.                                                                                                                 |
+| 0.4.0   | The main repository is divided into dedicated ones: plugins, services, web — separate repositories. Clean up the whole repository. Examples of integration with llamaindex, langchain, openai, litellm and haystack.                                                                        |