README: add travis badge

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

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 # dictzip-java
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+[![Build Status](https://travis-ci.org/dictzip/dictzip-java.svg?branch=master)](https://travis-ci.org/dictzip/dictzip-java)
+
 DictZip, GZip random access compression format(.dz), access library for Java
 
 [_![Download](https://api.bintray.com/packages/dictzip/maven/dictzip-lib/images/download.svg) ](https://bintray.com/dictzip/maven/dictzip-lib/_latestVersion)