Add travis-ci build status on the README.md

Author: eincs

README.md

@@ -1,5 +1,7 @@
 # Haeinsa
 
+[![Build Status](https://travis-ci.org/VCNC/haeinsa.svg?branch=master)](https://travis-ci.org/VCNC/haeinsa)
+
 Haeinsa is linearly scalable multi-row, multi-table transaction library for HBase.
 Haeinsa uses two-phase locking and optimistic concurrency control for implementing transaction.
 The isolation level of transaction is serializable.