add DispatchDoctor badge (#17)

Author: oameye

README.md

@@ -7,6 +7,8 @@
 [![Code Style: Blue](https://img.shields.io/badge/blue%20style%20-%20blue-4495d1.svg)](https://github.com/JuliaDiff/BlueStyle)
 [![Aqua QA](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 [![jet](https://img.shields.io/badge/%F0%9F%9B%A9%EF%B8%8F_tested_with-JET.jl-233f9a)](https://github.com/aviatesk/JET.jl)
+[![DispatchDoctor](https://img.shields.io/badge/%F0%9F%A9%BA_tested_with-DispatchDoctor.jl-blue?labelColor=white)](https://github.com/MilesCranmer/DispatchDoctor.jl)
+
 
 A Julia package for computing the Van Vleck canonical transformations recursion formula symbolically of rapidly driven systems.