Fix Lint

Author: schmidt-sebastian

packages/firestore/src/local/memory_persistence.ts

@@ -17,6 +17,7 @@
 
 import { User } from '../auth/user';
 import { ListenSequence } from '../core/listen_sequence';
+import { SnapshotVersion } from '../core/snapshot_version';
 import { ListenSequenceNumber, TargetId } from '../core/types';
 import { Document } from '../model/document';
 import { DocumentKey } from '../model/document_key';
@@ -52,7 +53,6 @@ import {
 } from './persistence_transaction';
 import { ReferenceSet } from './reference_set';
 import { TargetData } from './target_data';
-import { SnapshotVersion } from '../core/snapshot_version';
 
 const LOG_TAG = 'MemoryPersistence';
 /**