acknowledge @mattn for #138 #137 #136 #135

README.md

@@ -70,6 +70,7 @@ go get github.com/json-iterator/go
 Contributors
 
 * [thockin](https://github.com/thockin) 
+* [mattn](https://github.com/mattn)
 * [cch123](https://github.com/cch123)
 
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