Update README.md

Author: ChrisRackauckas

README.md

@@ -3,7 +3,6 @@
 [![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliaarrays.github.io/StaticArrayInterface.jl/stable)
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliaarrays.github.io/StaticArrayInterface.jl/dev)
 [![CI](https://github.com/JuliaArrays/StaticArrayInterface.jl/workflows/CI/badge.svg)](https://github.com/JuliaArrays/StaticArrayInterface.jl/actions?query=workflow%3ACI)
-[![CI (Julia nightly)](https://github.com/JuliaArrays/StaticArrayInterface.jl/workflows/CI%20(Julia%20nightly)/badge.svg)](https://github.com/JuliaArrays/StaticArrayInterface.jl/actions?query=workflow%3A%22CI+%28Julia+nightly%29%22)
 [![Build status](https://badge.buildkite.com/a2db252d92478e1d7196ee7454004efdfb6ab59496cbac91a2.svg?branch=master)](https://buildkite.com/julialang/StaticArrayInterface-dot-jl)
 [![codecov](https://codecov.io/gh/JuliaArrays/StaticArrayInterface.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaArrays/StaticArrayInterface.jl)
 
@@ -22,4 +21,4 @@ computation to occur at compile time.
 
 Because this library enforces things be done at compile time by encoding everything
 into types, using it will increase your compile times. You have been warned, now
-proceed (with caution).
+proceed (with caution).