docs(README): change lua code block style (#21)

Author: Antonio Costa

README.md

@@ -8,34 +8,32 @@ Using packer:
 
 ```lua
 use({
-  'nvim-neotest/neotest',
+  "nvim-neotest/neotest",
   requires = {
-    ...,
-    'nvim-neotest/neotest-go',
-  }
+    "nvim-neotest/neotest-go",
+    -- Your other test adapters here
+  },
   config = function()
     -- get neotest namespace (api call creates or returns namespace)
     local neotest_ns = vim.api.nvim_create_namespace("neotest")
     vim.diagnostic.config({
       virtual_text = {
         format = function(diagnostic)
-          local message = diagnostic.message
-          :gsub("\n", " ")
-          :gsub("\t", " ")
-          :gsub("%s+", " ")
-          :gsub("^%s+", "")
+          local message =
+            diagnostic.message:gsub("\n", " "):gsub("\t", " "):gsub("%s+", " "):gsub("^%s+", "")
           return message
         end,
       },
     }, neotest_ns)
-    require('neotest').setup({
-      ...,
+    require("neotest").setup({
+      -- your neotest config here
       adapters = {
-        require('neotest-go'),
-      }
+        require("neotest-go"),
+      },
     })
-  end
+  end,
 })
+
 ```
 
 The above mentioned `vim.diagnostic.config` is optional but recommended if you