Add Actions badge instead of Travis badge

README.md

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-# Obelisk [![Build Status](https://travis-ci.org/Lelio-Brun/Obelisk.svg?branch=master)](https://travis-ci.org/Lelio-Brun/Obelisk) [![Mentioned in Awesome OCaml](https://awesome.re/mentioned-badge.svg)](https://github.com/rizo/awesome-ocaml)
+# Obelisk ![Build Status](https://github.com/Lelio-Brun/Obelisk/actions/workflows/main.yml/badge.svg?branch=master) [![Mentioned in Awesome OCaml](https://awesome.re/mentioned-badge.svg)](https://github.com/rizo/awesome-ocaml)
 **Obelisk** is a simple tool that produces pretty-printed output from a [Menhir] parser file (_.mly_).
 
 It is inspired from [yacc2latex] and is also written in [OCaml], but is aimed at supporting features from Menhir instead of only those of [ocamlyacc].