Revert "use backup_cycle_timeout as value"

This reverts commit aa29d00dd33ef15255df1825c318aa87bbb44058.
diff --git a/README.md b/README.md
index 19641d8..a561d26 100755
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@
 by only one incremental backup(not counting ). And 2 incremental if
 `full_backup_depth` set to 2. Set to `0` if want all full backups.
 
-To avoid long stucking backup action, config `backup_cycle_timeout` should be
+To avoid long stucking backup action, config `backup_cycle_timout` should be
 set with a reasonable time that long enough for backups to complete but good
 enough to judge the backup process is stucking. When a backup process reach
 this timeout, it will remove the backup task and try to delete the volume