Update README.md

Author: Evgeny Shmarnev

README.md

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 1. SUSE, 2016 "Docker presentation and hands-on session" - [PDF](https://www.slideshare.net/slideshow/embed_code/key/16wAuaVKga8tib)
 2. DevConf CZ 2017 (Brno, Czech Republic) / "Portus: Claim Control of your Docker Images" - [PDF](pdfs/Portus.pdf), [video](https://www.youtube.com/watch?v=gjOOw_TV8vk)
 3. PyCon CZ 2017 (Prague, Czech Republic) / "Splinter: Web Apps Testing Framework" - [PDF](pdfs/Splinter.pdf), [video](https://www.youtube.com/watch?v=EDhRIiq8sV4)
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