Deprecate body_bytes to merge into body (#1739)

Co-authored-by: Adam Hopkins <admhpkns@gmail.com>

tests/test_response.py

@@ -1,6 +1,7 @@
 import asyncio
 import inspect
 import os
+import warnings
 
 from collections import namedtuple
 from mimetypes import guess_type
@@ -607,3 +608,17 @@ def test_empty_response(app):
     request, response = app.test_client.get("/test")
     assert response.content_type is None
     assert response.body == b""
+
+
+def test_response_body_bytes_deprecated(app):
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+
+        HTTPResponse(body_bytes=b'bytes')
+
+        assert len(w) == 1
+        assert issubclass(w[0].category, DeprecationWarning)
+        assert (
+            "Parameter `body_bytes` is deprecated, use `body` instead"
+            in str(w[0].message)
+        )