Merge 'upstream': docs, gitsigns, emoji, lsp

- fix: arguments for the `vim.lsp.Client.supports_method` method
- Add a blurb about installing missing emoji on Ubuntu
- fix (#1319): gitsigns deprecated functions
- docs: clarify using opts = {} vs config = function() ... require('plu…
- chore(docs): Update README.md

lua/kickstart/plugins/lspconfig.lua

@@ -115,7 +115,7 @@ return {
           --
           -- When you move your cursor, the highlights will be cleared (the second autocommand).
           local client = vim.lsp.get_client_by_id(event.data.client_id)
-          if client and client.supports_method(vim.lsp.protocol.Methods.textDocument_documentHighlight) then
+          if client and client:supports_method(vim.lsp.protocol.Methods.textDocument_documentHighlight) then
             local highlight_augroup = vim.api.nvim_create_augroup('kickstart-lsp-highlight', { clear = false })
             vim.api.nvim_create_autocmd({ 'CursorHold', 'CursorHoldI' }, {
               buffer = event.buf,
@@ -142,7 +142,7 @@ return {
           -- code, if the language server you are using supports them
           --
           -- This may be unwanted, since they displace some of your code
-          if client and client.supports_method(vim.lsp.protocol.Methods.textDocument_inlayHint) then
+          if client and client:supports_method(vim.lsp.protocol.Methods.textDocument_inlayHint) then
             map('<leader>th', function()
               vim.lsp.inlay_hint.enable(not vim.lsp.inlay_hint.is_enabled { bufnr = event.buf })
             end, '[T]oggle Inlay [H]ints')