Update README.md

Author: clarkmcc

README.md

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 # Goja Typescript Transpiler
 This package provides a simple interface using [github.com/dop251/goja](github.com/dop251/goja) under the hood to allow you to transpile Typescript to Javascript in Go. This package has no direct dependencies besides testing utilities and has a 95% test coverage rate.
 
+Feel free to contribute. This package is fresh and may experience some changes before it's first tagged release.
+
 ## Example
 For more examples, see the `examples/` directory of this repository
 ### Transpile Strings