chore: remove leftovers in readme (#281)

Author: Szymon-dziewonski

README.md

@@ -229,8 +229,6 @@ export default defineConfig({
     pluginVisualRegressionDiffConfig: { threshold: 0.01 },
   },
 });
-{
-}
 ```
 
 ```json
@@ -260,8 +258,6 @@ Sometimes we need to do a breaking change in image comparison or image generatio
 
 </details>
 
-DIFF_IMAGES_VERSION
-
 ## Questions
 
 Don’t hesitate to ask a question directly on the [discussions board](https://github.com/FRSOURCE/cypress-plugin-visual-regression-diff/discussions)!