README: fix a typo

Change-Id: I1ad1ba001f8fad0fffa9b6bd5b21dd58be4f6181
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/3902


Tested-by: jenkins
Reviewed-by: Chengyu Zheng <chengyu.zheng@polimi.it>

README

@@ -4,7 +4,7 @@ Welcome to OpenOCD!
 OpenOCD provides on-chip programming and debugging support with a
 layered architecture of JTAG interface and TAP support including:
 
-- (X)SVF playback to faciliate automated boundary scan and FPGA/CPLD
+- (X)SVF playback to facilitate automated boundary scan and FPGA/CPLD
   programming;
 - debug target support (e.g. ARM, MIPS): single-stepping,
   breakpoints/watchpoints, gprof profiling, etc;