ci: Fix doc deploy (#29)

* ci: let docdeploy use GITHUB_TOKEN

* README: show main branch codecov

Author: inkydragon

.github/workflows/ci.yml

@@ -92,4 +92,3 @@ jobs:
       - uses: julia-actions/julia-docdeploy@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}

README.md

@@ -2,6 +2,6 @@
 
 [![](https://img.shields.io/badge/docs-dev-blue.svg)](http://delimitedfiles.juliadata.org/dev/)
 [![CI](https://github.com/JuliaData/DelimitedFiles.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/JuliaData/DelimitedFiles.jl/actions/workflows/ci.yml)
-[![codecov](https://codecov.io/gh/JuliaLang/delimitedfiles.jl/graph/badge.svg?token=t34xJrFp7a)](https://codecov.io/gh/JuliaLang/delimitedfiles.jl)
+[![codecov](https://codecov.io/gh/JuliaLang/delimitedfiles.jl/branch/main/graph/badge.svg?token=t34xJrFp7a)](https://codecov.io/gh/JuliaLang/delimitedfiles.jl)
 
 This package ships as part of the Julia stdlib.