fix the missing constructor bug

Author: gdkrmr

lsp-julia.el

@@ -279,6 +279,7 @@ body."
     ,(concat "-e"
              "import Pkg; Pkg.instantiate(); "
              "using InteractiveUtils, Sockets, SymbolServer, LanguageServer;"
+             " Union{Int64, String}(x::String) = x; "
              " server = LanguageServer.LanguageServerInstance("
              " stdin, stdout,"
              (lsp-julia--get-root) ","