Update README.md

Update the Support platform from IOS to OSX
IOS is Embeded platform OS for Apple,
OSX is the X86 or PowerPC Platform OS for MacBook, IMac, Or Apple PC OS

@@ -209,7 +209,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
-* v1.0, 2014-07-27, support build on IOS(darwin). 0.9.177
+* v1.0, 2014-07-27, support build on OSX(Darwin). 0.9.177
 * v1.0, 2014-07-27, api connections add udp, add disk iops. 0.9.176
 * v1.0, 2014-07-26, complete config utest. 0.9.173
 * v1.0, 2014-07-26, fix [#124](https://github.com/winlinvip/simple-rtmp-server/issues/124), gop cache support disable video in publishing. 0.9.171.