modify readme.md

Author: kingiol

README renamed to README.md

@@ -2,6 +2,7 @@ NSObject+NSCoding and Archiver
 ------------------------------
 
 build by Kingiol
+
 [![Build Status](https://travis-ci.org/kingiol/NSObject-NSCoding.png?branch=master)](https://travis-ci.org/kingiol/NSObject-NSCoding)
 
 Mike Mayo
@@ -60,4 +61,4 @@ In your class implementation, call the automatic methods:
         [self autoDecode:coder];
     }
     return self;
-}
+}