Docs: remove strict argument from makedocs

The argument has been removed in v1.0.0 of Documenter. Building
documentation now fails by default, and the `strict` argument was thus
replaced by `warnonly`.

Author: barucden

docs/make.jl

@@ -9,7 +9,6 @@ makedocs(;
     repo="https://github.com/quinnj/JSON3.jl/blob/{commit}{path}#L{line}",
     sitename="JSON3.jl",
     authors="Jacob Quinn",
-    strict=true,
 )
 
 deploydocs(;