add tree branch indicator

Author: IanButterworth

base/loading.jl

@@ -860,7 +860,10 @@ function _require_search_from_serialized(pkg::PkgId, sourcepath::String, depth::
         else
             if LOAD_TIMING[Threads.threadid()]
                 elapsed = round((time_ns() - t_before) / 1e6, digits = 1)
-                println("""$(lpad(elapsed, 9)) ms  $(" "^(depth*2))$(pkg.name)""")
+                tree_prefix = depth == 0 ? "" : "$("  "^(depth-1))┌ "
+                print("$(lpad(elapsed, 9)) ms  ")
+                printstyled(tree_prefix, color = :light_black)
+                println(pkg.name)
             end
             return restored
         end