Add travis build status to README

README.md

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 # enumscribe
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+[![Build Status](https://travis-ci.com/Pantonshire/enumscribe.svg?branch=main)](https://travis-ci.com/Pantonshire/enumscribe)
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 This crate provides derive macros for converting between simple enums and strings. It also includes derive macros for [`serde::Serialize`](https://docs.serde.rs/serde/trait.Serialize.html) and [`serde::Deserialize`](https://docs.serde.rs/serde/trait.Deserialize.html) for simple enums.
 
 ## Usage