Add notice that getPanelCompletions is no longer recommended + update defaults in README

Author: zbirenbaum

README.md

@@ -68,7 +68,7 @@ The following is the default configuration:
 ```lua
 cmp = {
   enabled = true,
-  method = "getPanelCompletions",
+  method = "getCompletionsCycling",
 },
 panel = { -- no config options yet
   enabled = true,
@@ -80,9 +80,10 @@ server_opts_overrides = {},
 
 ##### cmp
 
-Set the enabled field to false if you do not wish to see copilot recommendations in nvim-cmp. Set the `method` field to `getCompletionsCycling` if you are having issues. getPanelCompletions seems to work just as quickly, and does not limit completions in the cmp menu to 3 recommendations. getPanelCompletions also allows for the comparator provided in copilot-cmp to not just place all copilot completions on top, but also sort them by the `score` copilot assigns them, which is not provided by getCompletionsCycling. Example:
+Set the enabled field to false if you do not wish to see copilot recommendations in nvim-cmp. Set the `method` field to `getCompletionsCycling` if you are having issues. getPanelCompletions previously worked just as quickly, and did not limit completions in the cmp menu to 3 recommendations, but has become so slow completions do not seem to appear due to recent changes from Microsoft. getPanelCompletions also allows for the comparator provided in copilot-cmp to not just place all copilot completions on top, but also sort them by the `score` copilot assigns them, which is not provided by getCompletionsCycling. Example:
 
 ```lua
+-- Recommended
 require("copilot").setup {
   cmp = {
     enabled = true,
@@ -91,6 +92,16 @@ require("copilot").setup {
 },
 ```
 
+```lua
+-- Not Currently Recommended
+require("copilot").setup {
+  cmp = {
+    enabled = true,
+    method = "getPanelCompletions",
+  }
+},
+```
+
 ##### panel
 
 Enabling panel creates the `CopilotPanel` command, which allows you to preview completions in a split window. Navigating to the split window allows you to jump between them and see each one. (<CR> to accept completion not yet implemented, coming soon)