chore: fix botched GenLSP upgrade (#162)

You have to set the buffer now, this should probably have raised and
should be fixed in GenLSP.

Author: mhanberg

lib/next_ls/lsp_supervisor.ex

@@ -55,10 +55,11 @@ defmodule NextLS.LSPSupervisor do
         {DynamicSupervisor, name: NextLS.DynamicSupervisor},
         {Task.Supervisor, name: NextLS.TaskSupervisor},
         {Task.Supervisor, name: :runtime_task_supervisor},
-        {GenLSP.Buffer, buffer_opts},
+        {GenLSP.Buffer, [name: NextLS.Buffer] ++ buffer_opts},
         {NextLS.DiagnosticCache, name: :diagnostic_cache},
         {Registry, name: NextLS.Registry, keys: :duplicate},
         {NextLS,
+         buffer: NextLS.Buffer,
          cache: :diagnostic_cache,
          task_supervisor: NextLS.TaskSupervisor,
          runtime_task_supervisor: :runtime_task_supervisor,