Update README.md

tankririri · web-flow · commit 9fba862a208a · 2016-08-11T17:53:47.000+08:00
diff --git a/README.md b/README.md
@@ -1,7 +1,7 @@
-  # RaspberryPi_CPU_PWM
+  # RaspberryPi_CPU_PWM  
   Raspberry Pi using software PWM to control the CPU fan speed.  
   使用软件PWM控制树莓派CPU风扇转速。
   
   使用方法
-  _______
+  ========
   详见http://www.zhangminghao.com/post/43.html
