Update CHANGELOG.md

Author: germanattanasio

CHANGELOG.md

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-Change Log
-==========
-
-## Version unreleased
-
-_2017-??-??_
-
-* Added: Natural Language Understanding model management APIs
-
-## Version 0.26.0
-
-_2017-05-16_
-
-* Added: Conversation endpoints for 2017-04-21 service release (entities, logs)
-* Added: Tone Analyzer `tone_chat`
-* Fixed: Unicode issues in Python 3
-
-## Version 0.25.2
-
-_2017-03-21_
-
-* Fixed: Speech to text supports `customization_id`
-* Fixed: Discovery now can create free instances
-
-## Version 0.25.1
-
-_2017-02-28_
-
-* Fixed: Natural Language Understanding base url
-
-## Version 0.25.0
-
-_2017-02-23_
-
-* Fixed: Natural Language Understanding importing
-* Added: Conversation workspace updating
-
-## Version 0.24.0
-
-_2017-02-21_
-
-* Added: Discovery configuration APIs
-* Added: Tradeoff Analytics find_preferable_options flag
-
-## Version 0.23.0
-
-_2016-12-21_
-
-* Added: Discovery v1
-* Fixed: Retrieve and Rank `top_answers`
-* Added: Tone Analyzer + Conversation example
-* Added: `speaker_labels` to Speech to Text
-* Fixed: Using UTF-8 when installing the documentation from the README in `setup.py`
-* Added: Speech to Text customizations
-* Added: Unit tests for AlchemyLanguage, Speech to Text and Discovery
-
-## Version 0.22.0
-
-_2016-11-03_
-
-* Added: Tradeoff Analytics `generate_visualization` flag
-* Fixed: AlchemyLanguage flags now passed as form fields when using `POST`
-
-
-## Version 0.21.0
-
-_2016-10-28_
-
-* Added: Personality Insights v3
-
-
-## Version 0.20.1
-
-_2016-10-13_
-
-* Fixed: Issue with Speech to Text parameters not working
-
-
-## Version 0.20.0
-
-_2016-09-30_
-
-* Added: Language Translator
-* Fixed: Deprecation to Language Translation
-* Removed: Conversation v1 experimental
-
-
-## Version 0.19.0
-
-_2016-08-30_
-
-* Fixed: Typo in the "language" parameter in Alchemy Language
-* Added: Targeted Emotion in Alchemy Language
-* Added: More supported parameters in Alchemy Language
-
-
-## Version 0.18.0
-
-_2016-07-22_
-
-* Added: Retraining for Visual Recognition classifiers
-* Added: Using custom models for Alchemy Language entities
-
-
-## Version 0.17.1
-
-_2016-07-17_
-
-* Fixed: `x_watson_learning_opt_out` value
-
-
-## Version 0.17.0
-
-_2016-07-14_
-
-* Fixed: Conversation default url
-* Added: `x_watson_learning_opt_out` option on the WatsonDeveloperCloud service
-
-
-## Version 0.16.0
-
-_2016-07-12_
-
-* New: Conversation v1 service
-
-
-## Version 0.15.0
-
-_2016-07-07_
-
-* New: index_document in Document Conversion
-* Fixed: bug with model_id in translation
-
-
-## Version 0.14.0
-
-_2016-06-12_
-
-* New: Conversation v1 experimental service
-
-
-## Version 0.13.0
-
-_2016-06-07_
-
- * New: Visual Recognition v3 service
- * New: Alchemy Language typed_relations
+Moved to [https://github.com/watson-developer-cloud/python-sdk/wiki/Changelog](https://github.com/watson-developer-cloud/python-sdk/wiki/Changelog)