README: adding travis graphic.

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 # Factor
 
+[![](https://api.travis-ci.org/factor/factor.svg)](https://travis-ci.org/factor/factor)
+
 Factor is a [concatenative](https://www.concatenative.org), stack-based
 programming language with [high-level
 features](https://concatenative.org/wiki/view/Factor/Features/The%20language)