Update README.md

Author: iqiukp

README.md

@@ -1,16 +1,17 @@
 ## Fault detection based on support vector data description (SVDD)
 
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 Updated on 28 May 2019	
 1. Added descriptions for the calculation of the radius 
-2. Added descriptions for the calculating the distance from the testing sample to the center of the sphere
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+2. Added descriptions for the calculation of the distance 
+   from the testing sample to the center of the sphere
+------------------------------------------------------------------- 
 
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+-------------------------------------------------------------------
 Updated on 24 May 2019	
 1. Fixed some function descriptions 
 2. Added support for some common kernel functions
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 ## demo
 ```