Add changelog

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+Group changes to describe their impact on the project, as follows:
+
+    Added for new features.
+    Changed for changes in existing functionality.
+    Deprecated for once-stable features removed in upcoming releases.é
+    Removed for deprecated features removed in this release.
+    Fixed for any bug fixes.
+    Security to invite users to upgrade in case of vulnerabilities.
+
+## [Unreleased]
+
+## [3.2.0] - 2016-11-10
+
+### Added
+- Change your password in your account settings
+- Open H264 binary download for Android < 5.1
+
+### Changed
+- Media H264 support improved for Android >= 5.1
+- Optimize memory footprint and performance of contacts list an IM view
+
+### Fixed
+- Crashes Android 6/7 at starting
+- Permissions issues
+- Layout of tablet views