docs(readme): updates examples to ESM

Author: saneef

README.md

@@ -9,7 +9,7 @@ This Eleventy plugin provides two [template filters](https://www.11ty.dev/docs/f
 
 🌏 This plugin is made primarily to populate `<updated>` fields in an RSS feed. Here is [a blog post on how to use this plugin](https://saneef.com/tutorials/fix-dates-on-eleventy-rss-feeds/) with [`eleventy-plugin-rss`](https://www.11ty.dev/docs/plugins/rss/).
 
-⚠️ Getting Git commit date is a bit slow (\~50ms for each path). So, use it sparingly. It's recommended to call this filter within a production flag.
+⚠️ Git commit date is a bit slow. So, it's recommended to call this filter within a production flag.
 
 ## Usage
 
@@ -22,13 +22,13 @@ npm install eleventy-plugin-git-commit-date
 ### 2. Add to Eleventy config
 
 ```js
-// .eleventy.js
+// eleventy.config.js
 
-const pluginGitCommitDate = require("eleventy-plugin-git-commit-date");
+import pluginGitCommitDate from "eleventy-plugin-git-commit-date";
 
-module.exports = function (eleventyConfig) {
+export default function (eleventyConfig) {
   eleventyConfig.addPlugin(pluginGitCommitDate);
-};
+}
 ```
 
 ### 3. Use in templates