Update README.md

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Sebastian Schlein 2015-07-31 14:32:25 +02:00
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* https://kraken.io/pro - Image optimization for website performance as a service - free plan up to 1MB filesize
* https://placehold.it/ - A quick and simple image placeholder service.
* https://placekitten.com/ - A quick and simple service for getting pictures of kittens for use as placeholders.
* http://placepenguin.com/ - A quick and simple service for placeholder images of penguins.
* http://embed.ly/ - Provides APIs for embeding media in a webpage, Responsive image Scaling, Extracting elements from a webpage. Free for up to 5,000 URLs per Month at 15 Requests per Second
* https://backhub.co/ - Backup and archive your GitHub repositories. Free for public repos.