Bump version to 0.3.1 and add the corresponding changelog entry.

Author: Paweł Kędzia

.version

@@ -1 +1 @@
-0.3.0
+0.3.1

CHANGELOG.md

@@ -13,4 +13,5 @@
 | 0.2.2   | Update dockerfile and requirements. Fix routing with vLLM.                                                                                                                                                                                                                                  |
 | 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`.                                                                                                                                                                                                       |
+| 0.3.0   | Anonymization available with three strategies: `fast_masker`, `genai`, `prov_masker`.                                                                                                                                                                                                       |
+| 0.3.1   | Refactoring `lb.strategies` to be more flexible modular.                                                                                                                                                                                                                                    |