add signature from anthraxx for svenstaro

keyring/packager/svenstaro/8FC15A064950A99DD1BD14DD39E4B877E62EB915/uid/Sven-Hendrik_Haase__svenstaro@archlinux.org_8871a8fb/certification/D8AFDDA07A5B6EDFA7D8CCDAD6D055F927843F1C.asc

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