doc: Add ChangeLog

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased][Unreleased]
+
+Added:
+
+1. Add *TelegramBot* constructor options:
+  * `options.https`
+  * `options.baseApiUrl`
+  * `options.filepath`
+1. Add methods:
+  * *TelegramBot#stopPolling()*
+  * *TelegramBot#isPolling()*
+  * *TelegramBot#openWebHook()*
+  * *TelegramBot#closeWebHook()*
+  * *TelegramBot#hasOpenWebHook()*
+  * *TelegramBot#deleteWebHook()*
+  * *TelegramBot#getWebHookInfo()*
+
+Changed:
+
+1. Use POST requests by default
+1. Ensure all relevant methods return Promises
+1. Document auto-deletion of webhook during polling
+1. Deprecate support for Node.js v0.12
+1. Fix consistency of methods signatures
+1. Rename *TelegramBot#initPolling()* to *TelegramBot#startPolling()*
+  * Deprecate *TelegramBot#initPolling()*
+
+Fixed:
+
+1. Handle error during formatting `formData`
+1. Fix ES6 syntax
+
+*Credits: Unless explicitly stated otherwise, above work was done by
+@GochoMugo*
+
+* * *
+
+## [0.25.0][0.25.0] - 2016-12-21
+
+Added:
+
+1. Supports the API v2.3 updates (by @kamikazechaser)
+1. Add *TelegramBot* constructor option:
+  * `options.request`: proxy extra request options (by @tarmolov)
+  * `options.onlyFirstMatch` (by @GingerPlusPlus)
+1. Add methods:
+  * *TelegramBot#sendVenue()* (by Tketa)
+  * *TelegramBot#sendContact()* (by @GochoMugo)
+  * *TelegramBot#getGameHighScores()* (by @jishnu7)
+
+Fixed:
+
+1. Fix request performance issue (by @preco21)
+1. Fix typos (by oflisback)
+
+
+[0.25.0]:https://github.com/yagop/node-telegram-bot-api/releases/tag/v0.25.0
+[Unreleased]:https://github.com/yagop/node-telegram-bot-api/compare/v0.25.0...master