Do not generate form parameters for read_only serializer fields

Fixes #261.

src/drf_yasg/inspectors/field.py

@@ -58,6 +58,7 @@ class InlineSerializerInspector(SerializerInspector):
             )
             for key, value
             in fields.items()
+            if not getattr(value, 'read_only', False)
         ]
 
         return self.add_manual_parameters(serializer, parameters)

src/drf_yasg/inspectors/view.py

@@ -6,13 +6,13 @@ from rest_framework.request import is_form_media_type
 from rest_framework.schemas import AutoSchema
 from rest_framework.status import is_success
 
-from .base import ViewInspector
 from .. import openapi
 from ..errors import SwaggerGenerationError
 from ..utils import (
     filter_none, force_real_str, force_serializer_instance, get_consumes, get_produces, guess_response_status,
     is_list_view, merge_params, no_body, param_list_to_odict
 )
+from .base import ViewInspector
 
 log = logging.getLogger(__name__)