+ sublevel.setPath() + internal _addHook function on sublevel for pre and post to add hook   * the hook search key can use relative key path now. * stream can use custom path,
+ sublevel.setPath()
+ internal _addHook function on sublevel for pre and post to add hook
  * the hook search key can use relative key path now.
* stream can use custom path,

snowyu/level-subkey