compatible for asyncpg 0.30.0 version

Author: hamedsh

src/gino/dialects/asyncpg.py

@@ -3,6 +3,7 @@
 import time
 import warnings
 
+from pip._internal.utils import packaging
 from sqlalchemy import util, exc, sql
 from sqlalchemy.dialects.postgresql import (  # noqa: F401
     ARRAY,
@@ -175,6 +176,8 @@ async def async_execute(self, query, timeout, args, limit=0, many=False):
 
         def executor(state, timeout_):
             if many:
+                if packaging.version.parse(asyncpg.__version__) >= packaging.version.parse('0.30.0'):
+                    return _protocol.bind_execute_many(state, args, "", timeout_, return_rows=True)
                 return _protocol.bind_execute_many(state, args, "", timeout_)
             else:
                 return _protocol.bind_execute(state, args, "", limit, True, timeout_)