fix: add default value for options annotation (#60)

Author: rfyiamcool

options.go

@@ -13,11 +13,13 @@ type Options struct {
 	//
 	// Setting the value to 0 disables the automatic background synchronization.
 	// Setting the value to -1 makes the DB call Sync() after every write operation.
+	// Default: 0
 	BackgroundSyncInterval time.Duration
 
 	// BackgroundCompactionInterval sets the amount of time between background Compact() calls.
 	//
 	// Setting the value to 0 disables the automatic background compaction.
+	// Default: 0
 	BackgroundCompactionInterval time.Duration
 
 	// FileSystem sets the file system implementation.