Replace stale README status badges

Author: danieleongari

README.md

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 # `forestci`: confidence intervals for Forest algorithms
 
-[![Travis Status](https://travis-ci.org/scikit-learn-contrib/forest-confidence-interval.svg?branch=master)](https://travis-ci.org/scikit-learn-contrib/forest-confidence-interval)
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 Forest algorithms are powerful [ensemble methods](http://scikit-learn.org/stable/modules/classes.html#module-sklearn.ensemble) for classification and regression.