don't make Experimental public API

Author: mortenpi

src/JuliaHub.jl

@@ -44,7 +44,8 @@ function _find_public_names()
     return filter(names(@__MODULE__; all=true)) do s
         # We don't need to check or mark public the main module itself
         (s == :JuliaHub) && return false
-        startswith(string(s), "_") && return false
+        # The Experimental module (or anything within it) is not public.
+        (s == :Experimental) && return false
         # Internal functions and types, prefixed by _
         startswith(string(s), "_") && return false
         # Internal macros, prefixed by _