add changelog (#448)

Author: KazuCocoa

CHANGELOG.md

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+# Changelogs
+Commit based release not is [release_notes.md](./release_notes.md)
+
+Release tags are https://github.com/appium/ruby_lib/releases .
+
+## v9.1.3
+
+Support selenium-webdriver 3.0.4+
+
+### 1. Enhancements
+- Improve performance for button/s and text/s #442
+- Should use `open_timeout` or `read_timeout` instead of `timeout` #436
+- add documentation for alternative long_press method #440
+
+### 2. Bug fixes
+
+### 3. Deprecations
+
+## v9.1.2
+### 1. Enhancements
+- add `appium_client_version`: https://github.com/appium/ruby_lib/issues/260
+- add some tests and fix some rubocop syntax errors
+
+### 2. Bug fixes
+- fix `set_immediate_value`: https://github.com/appium/ruby_lib/issues/263
+
+### 3. Deprecations
+
+## v9.1.1
+### 1. Enhancements
+
+### 2. Bug fixes
+- fix Finds exact in ios does not return an array #423 
+
+### 3. Deprecations
+
+Thanks @slipy12
+
+## v9.1.0
+### 1. Enhancements
+- update dependencies
+    - Support selenium-webdriver 3.0.2+
+        - If you'd like to use `selenium-webdriver2.x`, please use `appium_lib9.0.0`
+
+### 2. Bug fixes
+
+### 3. Deprecations
+- Drop Ruby 1.9.3, 2.0, 2.1 support
+    - Because these ruby versions have already stop updating.
+
+## v9.0.0
+### 1. Enhancements
+- Support `XCUITest` strategy for iOS
+    - Basically, `XCUITest` strategy is compatible with `Appium` strategy in this library.
+    - But users who use XPath should be check [this document](https://github.com/appium/ruby_lib/blob/master/docs/ios_xcuitest.md) since XPath has performance issue
+        - Users who use `find_element/s` should work fine.
+        - tests for elements are [here](https://github.com/appium/ruby_lib/tree/master/ios_tests/lib/ios/specs/ios/element)
+
+Special thanks to @montdidier 
+
+### 2. Bug fixes
+
+### 3. Deprecations
+
+
+## v8.2.1
+- fix arguments for `move_to` in `swipe` method.
+    - https://github.com/appium/ruby_lib/pull/405
+    - Please set `:delta_x` and `:delta_y` as the distance from start to move.