fix(build): snake_case service names (#190)

tests/included_service/src/lib.rs

@@ -5,4 +5,4 @@ pub mod pb {
 // Ensure that an RPC service, defined before including a file that defines
 // another service in a different protocol buffer package, is not incorrectly
 // cleared from the context of its package.
-type _Test = dyn pb::topservice_server::TopService;
+type _Test = dyn pb::top_service_server::TopService;