add CI build badge

jkthorne · Feb 25, 2020 · ab8e2b4 · ab8e2b4
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 # prime
 
+[![Build Status](https://travis-ci.com/wontruefree/prime.svg?branch=master)](https://travis-ci.com/wontruefree/prime)
+
 A basic implementation of a prime number generator.
 
 ## Installation