add badge with latest release (via JuliaHub)

Author: Datseris

README.md

@@ -2,6 +2,7 @@
 
 [![](https://img.shields.io/badge/docs-latest-blue.svg)](https://JuliaDynamics.github.io/DrWatson.jl/dev)
 [![CI](https://github.com/juliadynamics/DrWatson.jl/workflows/CI/badge.svg)](https://github.com/JuliaDynamics/DrWatson.jl/actions)
+[![Version](https://juliahub.com/docs/DrWatson/version.svg)](https://juliahub.com/ui/Packages/DrWatson/Vn5dT)
 [![codecov](https://codecov.io/gh/JuliaDynamics/DrWatson.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaDynamics/DrWatson.jl)
 [![DOI](https://joss.theoj.org/papers/10.21105/joss.02673/status.svg)](https://doi.org/10.21105/joss.02673)
 [![Package Downloads](https://shields.io/endpoint?url=https://pkgs.genieframework.com/api/v1/badge/DrWatson)](https://pkgs.genieframework.com?packages=DrWatson)