Add Changelog and move it to v2.0.0 (#1540)

Co-authored-by: Josh Kalderimis <josh.kalderimis@gmail.com>

CHANGELOG.md

@@ -0,0 +1,42 @@
+# Changelog
+
+## v2.0.0
+
+Trying to create a Changelog from the previous tagged version `v1.3.0` from
+January 2023 is frankly a bit much.
+
+The fundamentals:
+
+- Performant at scale: It is used in production with hundreds of thousands of connected devices. It works well.
+- Remove AWS: It is now easy to run and set up on any hosting platform
+
+There is also a lot more. The [initial announcement of 2.0](https://elixirforum.com/t/introducing-nerveshub-2-0/55531/5)
+has the basic idea. The only idea that isn't currently actively pursued or
+already delivered is MQTT and that is bound to pop up again in the future.
+
+A lot of this work should be credited to Eric Oestrich and he gave an update
+on it at [the Nerves Meetup](https://www.youtube.com/watch?v=vSYbSTXL26I).
+
+Jon Carstens covered some of the work during
+[his NervesConf talk](https://www.youtube.com/watch?v=lHcC9gwk_rg) as a well.
+
+After the 2.x changes were available Josh Kalderimis joined in and started
+looking at ease of use which led to a lot of various improvements but the
+biggest one is the alternative device authentication method: Shared Secret
+
+Since then we have contributions from 19 people where Eric Oestrich dominates
+the stats. Followed by Josh Kalderimis. Then Jon Carstens. 
+
+There are a lot of things planned. SmartRent, NervesCloud and other users of
+the project are in active collaboration on improving the featureset, the
+performance and the user experience. We want this to be not just a great tool
+for developers that choose Nerves but a surprising delight and joy to use.
+
+### Migration
+
+You should be able to migrate using the Ecto migrations. Nothing should be
+break if you migrate a 1.x install to the 2.x releases. We still recommend
+that you set aside time for dealing with anything unusual that might come up.
+
+You may also need some time to deprovision the AWS resources you no longer
+need.

mix.exs

@@ -4,7 +4,7 @@ defmodule NervesHub.MixProject do
   def project do
     [
       app: :nerves_hub,
-      version: "0.1.0",
+      version: "2.0.0",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       aliases: aliases(),