Update README.md

README.md

@@ -16,6 +16,7 @@ This simple system allows for excellent compression of uri encoded JSON strings
 * Download from github or use `npm install jsoncrush`
 * Import JSONCrush as a module with something like `import JSONCrush from './JSONCrush.js'`
 * Just pass a JSON string to `JSONCrush.crush()` to compress it!
+* If used in a url you must call `encodeURIComponent()` to escape any special characters.
 * To decode just pass the crushed string to `JSONCrush.uncrush()`
 * See [index.html](https://github.com/KilledByAPixel/JSONCrush/blob/master/index.html) for a demonstration.