reduce whitespace (integrated into image)

README.md

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 !["Greenlock Function"](https://git.coolaj86.com/coolaj86/greenlock.js/raw/branch/master/logo/from-not-secure-to-secure-url-bar.png "from url bar showing not secure to url bar showing secure")
 
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     <td><a href="https://medium.com/@bohou/secure-your-nodejs-server-with-letsencrypt-for-free-f8925742faa9" target="_blank"><img src="https://git.coolaj86.com/coolaj86/greenlock.js/raw/branch/master/logo/ibm-301x112.png"></a></td>