added travisci badge in readme
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matthiasn/lambdacd,tobiasbayer/lambdacd,cz8s/lambdacd,tobiasbayer/lambdacd,matthiasn/lambdacd,flosell/lambdacd,cz8s/lambdacd,cz8s/lambdacd,flosell/lambdacd,matthiasn/lambdacd,tobiasbayer/lambdacd,flosell/lambdacd