Change docs path from latest to dev (#141)

As suggested in https://documenter.juliadocs.org/stable/man/hosting/#The-deploydocs-Function

Author: jishnub

README.md

@@ -6,7 +6,7 @@ A Julia package for representing block-banded matrices and banded-block-banded m
 [![Aqua QA](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 
 [![](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaLinearAlgebra.github.io/BlockBandedMatrices.jl/stable)
-[![](https://img.shields.io/badge/docs-latest-blue.svg)](https://JuliaLinearAlgebra.github.io/BlockBandedMatrices.jl/latest)
+[![](https://img.shields.io/badge/docs-latest-blue.svg)](https://JuliaLinearAlgebra.github.io/BlockBandedMatrices.jl/dev)