Asynchronous Mail Send example - added an a href tag to section.

LiYChristopher · LiYChristopher · commit 5488528f90db · 2017-10-06T08:54:16.000-06:00
diff --git a/USE_CASES.md b/USE_CASES.md
@@ -171,6 +171,7 @@ print(response.body)
 print(response.headers)
 ```
 
+<a name="asynchronous-mail-send"></a>
 # Asynchronous Mail Send
 
 ## Using `asyncio` (3.5+)
