Commits on Apr 5, 2020

1. Breaking: parent db must support deferredOpen …

   DeferredOpen means that the db opens itself and defers operations
   until it's open. Currently that's only supported by levelup (and
   levelup factories like level). Previously, subleveldown would also
   accept abstract-leveldown db's that were not wrapped in levelup.
   
   Opening and closing a sublevel no longer opens or closes the parent
   db. The sublevel does wait for the parent to open (which in the
   case of levelup already happens automatically) but never initiates
   a state change.
   
   If one closes the parent but not the sublevel, subsequent
   operations (like get and put) on the sublevel will yield an error,
   to prevent segmentation faults from underlying stores.
   
   Drops support of old modules:
   
   - memdb (use level-mem instead)
   - deferred-leveldown < 2.0.0 (and thus levelup < 2.0.0)
   - abstract-leveldown < 2.4.0
   
   Closes #84, #83 and #60.

   

   vweevers committed Apr 5, 2020
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