change build status to travis-ci.com
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-[![Build Status](https://travis-ci.org/herumi/xbyak.png)](https://travis-ci.org/herumi/xbyak)
+[![Build Status](https://api.travis-ci.com/herumi/xbyak.svg?branch=master)](https://travis-ci.com/github/herumi/xbyak)
 
 # Xbyak 5.991 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++