added checksum to note_attachment

db/migrations/0213__note_attachments.sql

@@ -5,6 +5,7 @@ CREATE TABLE IF NOT EXISTS "note_attachments"
     name         TEXT not null,
     mime         TEXT not null,
     isProtected    INT  not null DEFAULT 0,
+    contentCheckSum    TEXT not null,
     utcDateModified TEXT not null,
     isDeleted    INT  not null,
     `deleteId`    TEXT DEFAULT NULL);