Bump version to 2.0

- Ressurrect Changelog
- Ressurect Demo

Author: Kyle Rockman

CHANGELOG.md

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+# [v2.0.0](https://github.com/mixpanel/mixpanel-unity/releases/tag/v2.0.0)
+### April 12th - 2018
+
+#### This version is a complete rewrite of the library to support ALL platforms that unity can compile to.
+
+The basis for this rewrite was https://github.com/mixpanel/mixpanel-unity/issues/10 to support WebGL but since the library was rewriten in plain c# it should work for any platform unity can compile to.
+
+The API has stayed complient with the documentation though there maybe a few changes to a few of the mixpanel properties that come though automatically due to unity not having access to certain system/device information easily
+
+The github repo has also been structured so that it supports the Unity 2018.3 package manager (please see the README for package manager install instructions)
+
+---
+
+# [v1.1.1](https://github.com/mixpanel/mixpanel-unity/releases/tag/v1.1.1)
+### December 18th - 2017
+
+Bug fixes
+
+---
+
+# [v1.1.0](https://github.com/mixpanel/mixpanel-unity/releases/tag/v1.1.0)
+### October 6th - 2017
+
+Improvements
+Persist alias and protect users from identifying the user as their alias
+Reset distinct_id and alias when reset is called
+Clean ups
+Fixes
+Switching platforms could lead to MixpanelPostProcessor been executed at the wrong time
+Reversed the attribution of app build number and version string ($app_build_number and $app_version_string)
+Fix crash occurring only for Android when AdvertisingIdClient.Info.getId() was returning null.
+
+---
+
+# [v1.0.1](https://github.com/mixpanel/mixpanel-unity/releases/tag/1.0.1)
+### June 16th - 2016
+
+iOS
+Added optional support for advertisingIdentifier
+Added support for Bitcode
+Windows
+Added missing dependency for x86 and x86_64
+All Platforms
+Networking now respects the HTTP Retry-After header
+Networking now backs off exponentially on failure
+
+---
+
+# [v1.0.0](https://github.com/mixpanel/mixpanel-unity/releases/tag/1.0.0)
+### June 3rd - 2016
+
+We are thrilled to release the official Mixpanel Unity SDK. Some links to get started:
+
+* [Official documentation](https://mixpanel.com/help/reference/unity)
+* [Full API Reference](http://mixpanel.github.io/mixpanel-unity/api-reference/annotated.html)
+* [Sample application](https://github.com/mixpanel/mixpanel-unity/tree/master/deployments/UnityMixpanel/Assets/Mixpanel/Sample)