docs: fixed instructions to install using lazy plugin manager (#148)

This is a docs fix, will not ship tags/release: NONE

README.md

@@ -59,8 +59,8 @@ return {
     "sindrets/diffview.nvim",
     "stevearc/dressing.nvim", -- Recommended but not required. Better UI for pickers.
     "nvim-tree/nvim-web-devicons" -- Recommended but not required. Icons in discussion tree.
-    enabled = true,
   },
+  enabled = true,
   build = function () require("gitlab.server").build(true) end, -- Builds the Go binary
   config = function()
     require("gitlab").setup()