Update README.md

README.md

@@ -4,7 +4,7 @@ ucore os labs was used as OS Experiments in OS Course Of Dept. of Computer Scien
 
 NEWS
 ====
-- 2018.02.03：ucore os labs were ported on RISC-V CPU（privileged arch spec 1.10). You can access [repo's riscv32-priv-1.10 branch(https://github.com/chyyuu/ucore_os_lab/tree/riscv32-priv-1.10)
+- 2018.02.03：ucore os labs were ported on RISC-V CPU（privileged arch spec 1.10). You can access [repo's riscv32-priv-1.10 branch](https://github.com/chyyuu/ucore_os_lab/tree/riscv32-priv-1.10
)
 
 MAINTAINERS
 ===========