Add Requirements and fix bug in send response

.idea/watcherTasks.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ProjectTasksOptions">
-    <TaskOptions isEnabled="true">
+    <TaskOptions isEnabled="false">
       <option name="arguments" value="$FilePath$" />
       <option name="checkSyntaxErrors" value="true" />
       <option name="description" />

lib/api.py

@@ -104,7 +104,7 @@ class API:
                 if isinstance(resp, bytes):
                     break
 
-                if resp.get("retry_after_ms"):
+                if isinstance(resp, dict) and resp.get("retry_after_ms"):
                     await asyncio.sleep(resp["retry_after_ms"] / 1000)
                 else:
                     break

requirements.txt

@@ -0,0 +1 @@
+aiohttp