Updated Readme and added changelog

Author: lolleko

Changelog.md

@@ -0,0 +1,4 @@
+# 0.3.0
+
+- Updated to the latest version of the [tstl plugin](https://github.com/TypeScriptToLua/typescript-tstl-plugin) see [the changelog](https://github.com/TypeScriptToLua/typescript-tstl-plugin/blob/master/Changelog.md) for more information
+- Updated the config JSON schema to match the latest TSTL release

README.md

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-[![](https://vsmarketplacebadge.apphb.com/version/ark120202.vscode-typescript-to-lua.svg)](https://marketplace.visualstudio.com/items?itemName=ark120202.vscode-typescript-to-lua)
-
 A Visual Studio Code extension that adds [TypeScriptToLua](https://typescripttolua.github.io)
 support for TypeScript using the
 [TypeScript TypeScriptToLua Language Service plugin](https://github.com/TypeScriptToLua/typescript-tstl-plugin).
 
+Marketplace link: https://marketplace.visualstudio.com/items?itemName=typescript-to-lua.vscode-typescript-to-lua
+
 ## Usage
 
 This extension activates automatically when project's `tsconfig.json` file has `"tstl"` key.