Fix #207 (#208)

* Attempt to use larger pool.

* Fix typo.

Author: kklein

tests/integration/conftest.py

@@ -52,7 +52,9 @@ def conn_creator():
         # gcp_project = os.environ.get("GOOGLE_CLOUD_PROJECT", "scratch-361908")
         connection_string = "bigquery://"
 
-    engine = sa.create_engine(connection_string, echo=True)
+    engine = sa.create_engine(
+        connection_string, echo=True, pool_size=10, max_overflow=20
+    )
     apply_patches(engine)
 
     return engine