Docs to LTS

Author: ChrisRackauckas

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: julia-actions/setup-julia@latest
         with:
-          version: '1.2'
+          version: '1.6'
       - run: julia --color=yes -e 'using Pkg; VERSION >= v"1.5-" && !isdir(joinpath(DEPOT_PATH[1], "registries", "General")) && Pkg.Registry.add("General")'
         shell: bash
         env: