Add status badge for travis builds

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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
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 # pfm
 
 [![pfm status badge](https://jranke.r-universe.dev/badges/pfm)](https://jranke.r-universe.dev/ui/#package:pfm)
+[![Build Status](https://app.travis-ci.com/jranke/pfm.svg?token=Sq9VuYWyRz2FbBLxu6DK&branch=main)](https://app.travis-ci.com/jranke/pfm)
 [![codecov](https://codecov.io/github/jranke/pfm/branch/main/graphs/badge.svg)](https://codecov.io/github/jranke/pfm) 
 
 The R package **pfm** provides some utilities for fate modelling, including