add figure for travis in README

SpM-lab · Oct 29, 2018 · 10fca6f · 10fca6f
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 SPM
 ====
+[![Build Status](https://travis-ci.org/SpM-lab/SpM.svg?branch=master)](https://travis-ci.org/SpM-lab/SpM)
 
 Sparse Modeling tool for analytical continuation.