Doc typo fix (#349)

idlesign · mblayman · commit 485953f2adc9 · 2017-05-17T08:29:09.000-04:00
diff --git a/docs/usage.md b/docs/usage.md
@@ -44,7 +44,7 @@ rather than from vanilla DRF. For example,
 ```python
 from rest_framework_json_api import serializers
 
-class MyModelSerializer(serializers.ModelSerializers):
+class MyModelSerializer(serializers.ModelSerializer):
     # ...
 ```
 
