Updated Package Version, README and CHANGELOG

CHANGELOG.md

 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [1.0.0-preview] - 2020-01-07
+## [2.0.0-preview] - 2020-03-23
+
+* Refactored Processor API
+* C# API Accessibility
+* Package Conformance and Validation
+
+## [1.0.0-preview] - 2019-06-28
 
 * Initial Version

README.md

 #### Local Package Install : 
 
 * Git Clone this repository (or download zip and unzip locally)
-* Install Unity 2019.1 or newer and run it for your project
+* Install Unity 2019.3 or newer and run it for your project
-* Use the + Button at the bottom of the window and select "Add Package from Disk"
+* Use the + Button located at the top-left of the window and select "Add Package from Disk"
-* Install Unity 2019.1 or newer
+* Install Unity 2019.3 or newer
-* Add the following line to `dependencies` list :  `"com.unity.vfx-toolbox": "https://github.com/Unity-Technologies/VFXToolbox.git#1.0.0-preview",`
-
-You should be good to go!
+* Add the following line to `dependencies` list :  `"com.unity.vfx-toolbox": "https://github.com/Unity-Technologies/VFXToolbox.git#2.0.0-preview",`
 
 ## Image Sequencer
 

package.json

 {
   "name": "com.unity.vfx-toolbox",
   "displayName": "VFX Toolbox",
-  "version": "1.0.0-preview",
+  "version": "2.0.0-preview",
   "description": "Additional Tools for VFX Artists.\n\n* Image Sequencer\n* Houdini Exporters for Visual Effect Graph",
   "keywords": [
     "vfx",
   ],
   "type": "tool",
   "hideInEditor": false,
-  "unity": "2019.1"
+  "unity": "2019.3"
 }