update readme for v2

Author: Bart Veneman

readme.md

@@ -14,9 +14,10 @@ npm install css-time-sort
 ```js
 import { convert, compare } from "css-time-sort";
 
+// Using `compare` will sort an array from short to long times:
 let result = ["3s", "2ms"].sort(compare); // ["2ms", "3s"]
 
-// Converting time-like values
+// Converting time-like values converts the input to ms:
 convert("1s"); // 1000
 convert("1ms"); // 1
 convert("+2ms"); // 2