Mention OG_HTML_DEBUG flag in contributing (#77)
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@ -17,3 +17,5 @@ To start hacking, do the following:
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5. If necessary, edit the `exePath` in [options.ts](https://github.com/zeit/og-image/blob/master/src/options.ts) to point to your local Chrome executable
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Now you're ready to start local development!
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You can set an environment variable to assist with debugging `export OG_HTML_DEBUG=1`. This will render the image as HTML so you can play around with your browser's dev tools before committing changes to the template.
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