Add dependency-ci badge

Author: TomBebbington

README.md

@@ -4,6 +4,7 @@ LLVM-rs
 [![Crate Downloads](https://img.shields.io/crates/d/llvm-alt.svg)](https://crates.io/crates/llvm-alt)
 [![Crate License](https://img.shields.io/crates/l/llvm-alt.svg)](https://crates.io/crates/llvm-alt)
 [![Build Status](https://travis-ci.org/TomBebbington/llvm-rs.svg?branch=master)](https://travis-ci.org/TomBebbington/llvm-rs)
+[![Dependency Status](https://dependencyci.com/github/TomBebbington/llvm-rs/badge)](https://dependencyci.com/github/TomBebbington/llvm-rs)
 
 This is a library that wraps [LLVM](http://llvm.org) using Rust idioms and the cbox library. There is
 [good quality documentation available](https://tombebbington.github.io/llvm-rs/) if you