Update README.md

README.md

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 INTRODUCTION
 ============
-ucore labs was used as OS Experiments in OS Course Of Dept. of Computer Science & Technology, Tsinghua University.
+ucore os labs was used as OS Experiments in OS Course Of Dept. of Computer Science & Technology, Tsinghua University.
+
+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)
 
 MAINTAINERS
 ===========