增加用户密码修改成功的API测试，以及增加用户邮箱字段并做了相应的API测试，目前的account/view.py测试覆盖率为100%

account/serializers.py

@@ -11,10 +11,15 @@ class UsernameCheckSerializer(serializers.Serializer):
     username = serializers.CharField(max_length=30)
 
 
+class EmailCheckSerializer(serializers.Serializer):
+    email = serializers.EmailField(max_length=254)
+
+
 class UserRegisterSerializer(serializers.Serializer):
     username = serializers.CharField(max_length=30)
     real_name = serializers.CharField(max_length=30)
     password = serializers.CharField(max_length=30, min_length=6)
+    email = serializers.EmailField(max_length=254)
 
 
 class UserChangePasswordSerializer(serializers.Serializer):