Merge pull request #472 from GeraldHost/master

Update readme playstation typo

readme.md

@@ -81,7 +81,7 @@ AIX, Amiga OS, Android, Arch, Bada, BeOS, BlackBerry, CentOS, Chromium OS,
 Contiki, Fedora, Firefox OS, FreeBSD, Debian, DragonFly, Fuchsia, Gentoo, GNU,
 Haiku, Hurd, iOS, Joli, KaiOS, Linpus, Linux, Mac OS, Mageia, Mandriva, MeeGo,
 Minix, Mint, Morph OS, NetBSD, Nintendo, OpenBSD, OpenVMS, OS/2, Palm, PC-BSD,
-PCLinuxOS, Plan9, Playstation, QNX, RedHat, RIM Tablet OS, RISC OS, Sailfish,
+PCLinuxOS, Plan9, PlayStation, QNX, RedHat, RIM Tablet OS, RISC OS, Sailfish,
 Series40, Slackware, Solaris, SUSE, Symbian, Tizen, Ubuntu, Unix, VectorLinux,
 WebOS, Windows [Phone/Mobile], Zenwalk, ...