Added CHANGELOG with version 2.0.0 changelog

Author: igo95862

CHANGELOG.md

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+## 2.0.0
+
+### Warning if you used pre-release version
+
+`connection_profile` of `NetworkConnectionSettings` object has been replaced with
+equivalent `get_profile` method which can also fetch the secrets fields. (you can
+use `mypy` to check)
+
+### Breaking changes
+
+* Renamed certain elements of `ConnectionType` enum to match `DeviceType` enum.
+
+  * `WIRED` -> `ETHERNET`
+  * `GSM` -> `MODEM`
+
+### Features
+
+* Added connection settings dataclasses.
+  Those dataclasses are found under `networkmanager.settings` sub-package.
+  They allow for easy and typed reading, modifying and writing connection settings
+  without dealing with D-Bus variants.
+
+  Thank you @bernhardkaindl for spearheading this feature.
+
+  New methods have been added to existing interfaces that utilize the new dataclasses:
+
+  * `NetworkManagerSettingsConnectionInterface`
+
+    * `get_profile`
+    * `update_profile`
+
+  * `NetworkManagerSettingsInterface`
+
+    * `add_connection_profile`
+
+  * `NetworkManagerInterfaceAsync`
+
+    * `add_and_activate_connection_profile`
+
+* Added support for loopback devices from NetworkManager 1.42
+
+## 1.1.0
+
+### Features
+
+* Added NetworkManager errors as named exceptions.
+
+## 1.0.0
+
+Initial release.