doc update

docs/utils.md

@@ -1,6 +1,7 @@
 # Table of Contents
 
 * [jc.utils](#jc.utils)
+  * [asciify](#jc.utils.asciify)
   * [warning\_message](#jc.utils.warning_message)
   * [error\_message](#jc.utils.error_message)
   * [compatibility](#jc.utils.compatibility)
@@ -18,6 +19,17 @@
 
 jc - JSON Convert utils
 
+<a id="jc.utils.asciify"></a>
+
+### asciify
+
+```python
+def asciify(string: str) -> str
+```
+
+Return a string downgraded from Unicode to ASCII with some simple
+conversions.
+
 <a id="jc.utils.warning_message"></a>
 
 ### warning\_message