Add dependency badge to README.md

README.md

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 # egui-file-dialog
 [![Latest version](https://img.shields.io/crates/v/egui-file-dialog.svg)](https://crates.io/crates/egui-file-dialog)
 [![Documentation](https://docs.rs/egui-file-dialog/badge.svg)](https://docs.rs/egui-file-dialog)
+[![Dependency status](https://deps.rs/repo/github/fluxxcode/egui-file-dialog/status.svg)](https://deps.rs/repo/github/fluxxcode/egui-file-dialog)
 [![MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/fluxxcode/egui-file-dialog/blob/master/LICENSE)
 
 This repository provides an easy-to-use file dialog (a.k.a. file explorer, file picker) for [egui](https://github.com/emilk/egui). This makes it possible to use a file dialog directly in the egui application without having to rely on the file explorer of the operating system.