Fix import in test

Author: ninjascant

tests/ethereumetl/service/test_eth_service.py

@@ -27,6 +27,7 @@
 
 from ethereumetl.service.eth_service import EthService
 from ethereumetl.service.graph_operations import OutOfBoundsError
+from ethereumetl.web3_utils import build_web3
 from tests.helpers import skip_if_slow_tests_disabled