Update README.md

Author: ianharrigan

README.md

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-**_Important Note: currently in the alpha release of `haxeui-kha` only the `Kha` HTML5 renderer is supported, using different renderer will most likely cause compilation errors._**
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 ## Installation
  * `haxeui-kha` has a dependency to <a href="https://github.com/haxeui/haxeui-core">`haxeui-core`</a>, and so that too must be installed.
  * `haxeui-kha` also has a dependency to <a href="https://github.com/KTXSoftware/Kha">Kha</a>, please refer to the installation instructions on their <a href="https://github.com/KTXSoftware/Kha">site</a>.