docs: change config to opts in example lazy.nvim cfg

Closes #15

README.md

@@ -5,17 +5,18 @@
 ![tidy-demo](https://github.com/mcauley-penney/tidy.nvim/assets/59481467/f3807c69-2b36-4a14-b83a-dd0f2829e096)
 
 ## Features
+
 - Remove white space at the end of every line on save
 - Remove empty lines at the end of the buffer on save
 
-
 ## Requirements
+
 - Neovim >= 0.9.0
 
 It may (should) work on lower versions, but is tested and updated using nightly.
 
-
 ## Installation
+
 Your installation configuration will depend on your plugin manager. Below is the basic installation (using default options) for lazy.nvim.
 
 ```lua
@@ -25,8 +26,8 @@ Your installation configuration will depend on your plugin manager. Below is the
 }
 ```
 
-
 ## Configuration
+
 tidy.nvim comes with the following options and their default settings:
 
 ```lua
@@ -35,13 +36,12 @@ tidy.nvim comes with the following options and their default settings:
     }
 ```
 
-
 A more full example configuration for lazy.nvim would be:
 
 ```lua
 {
     "mcauley-penney/tidy.nvim",
-    config = {
+    opts = {
         filetype_exclude = { "markdown", "diff" }
     },
     init = function()
@@ -50,16 +50,16 @@ A more full example configuration for lazy.nvim would be:
 }
 ```
 
-
 ## Usage
+
 tidy.nvim comes with the following functions:
 
-| Lua                              | Description                                                                                                                                          |
-| -------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `require("tidy").toggle()`       | Turn tidy.nvim off for the current buffer a plugin                                                                                                   |
-
+| Lua                        | Description                                        |
+| -------------------------- | -------------------------------------------------- |
+| `require("tidy").toggle()` | Turn tidy.nvim off for the current buffer a plugin |
 
 ## About and Credits
+
 I originally wrote this as a wrapper around a couple of vim regex commands used for formatting files before I began using formatters. These commands are not mine, please see the sources below. Even with real formatters in my setup now, I still like and use this because I like these specific formats to be applied to every buffer and don't want to have a formatting tool installed for them.
 
 - [Vim Tips Wiki entry for removing unwanted spaces](https://vim.fandom.com/wiki/Remove_unwanted_spaces#Automatically_removing_all_trailing_whitespace)
@@ -67,5 +67,5 @@ I originally wrote this as a wrapper around a couple of vim regex commands used
 - `ib.`, the author of [this Stack Overflow answer](https://stackoverflow.com/a/7501902)
 
 - [This line](https://github.com/gpanders/editorconfig.nvim/blob/ae3586771996b2fb1662eb0c17f5d1f4f5759bb7/lua/editorconfig.lua#L180)
-in [gpanders/editorconfig.nvim](https://github.com/gpanders/editorconfig.nvim) for exposing me to the `keepjumps`
-and `keeppatterns` modifiers
+  in [gpanders/editorconfig.nvim](https://github.com/gpanders/editorconfig.nvim) for exposing me to the `keepjumps`
+  and `keeppatterns` modifiers