Move changelog to separate file

CHANGELOG.md

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+# Hass.io Plejd add-on
+
+_v 0.4.5_:
+
+- FIX: Resolved a Docker build error
+
+_v 0.4.4_:
+
+- FIX: Disabled AppArmor Policy since there's been a lot of issues with that.
+
+_v 0.4.3_:
+
+- FIX: Updated add-on to work with the API changes made by Plejd.
+
+_v 0.4.0_:
+
+- NEW: Implemented support for Plejd scenes, each scene appears as a switch in Home Assistant.
+- NEW: _WPH-01_ is supported and generates two switches (left and right button).
+- NEW: Write queues, finally able to incorporate Plejd devices in HA automations/scenes etc.
+
+_v 0.3.4_:
+
+- NEW: `connectionTimeout` configuration parameter to enable tweaking of wait time on connection, usable for RPi 3B+.
+- FIX: Reworked some logging to get better understanding of what happens.
+
+_v 0.3.0_:
+
+- NEW: New BLE manager, DBus instead of noble
+- FIX: Adding entities as devices now as well
+- FIX: Bug fixes
+
+_v 0.2.8_:
+
+- FIX: Reset characteristic state on disconnect
+
+_v 0.2.7_:
+
+- FIX: Added exception handling to unsubscribing lastData characteristic if already disconnected
+
+_v 0.2.6_:
+
+- FIX: Added null check to remove listeners for characteristics
+
+_v 0.2.5_:
+
+- FIX: Invalid scene id in events/scene message
+
+_v 0.2.4_:
+
+- Stability improvements
+
+_v 0.2.3_:
+
+- FIX: Container build error fix
+
+_v 0.2.2_:
+
+- Stability improvements
+
+_v 0.2.1_:
+
+- Stability improvements
+
+_v 0.2.0_:
+
+- Stability improvements
+- Bugfixes
+
+_v 0.1.1_:
+
+- FIX: Fixed missing reference on startup, preventing add-on from starting
+
+_v 0.1.0_:
+
+- NEW: Rewrote the BLE integration for more stability
+- FIX: discovery wasn't always sent
+
+_previous_:
+
+- FIX: bug preventing add-on from building
+- NEW: Added support for Plejd devices with multiple outputs (such as DIM-02)