Badger v1.5.0 Release

• Introduce NumVersionsToKeep option. This option is used to discard many
  versions of the same key, which saves space.
• Add a new SetWithDiscard method, which would indicate that all the older
  versions of the key are now invalid. Those versions would be discarded during
  compactions.
• Value log GC moves are now bound to another keyspace to ensure latest versions
  of data are always at the top in LSM tree.
• Introduce ValueLogMaxEntries to restrict the number of key-value pairs per
  value log file. This helps bound the time it takes to garbage collect one
  file.

BadgerDB v1.4.0

• Make mmap-ing of value log optional.
• Run GC multiple times, based on recorded discard statistics.
• Add MergeOperator.
• Force compact L0 on close (#439).
• Add truncate option to warn about data loss (#452).
• Discard key versions during compaction (#464).
• Introduce new LSMOnlyOptions, to make Badger act like a typical LSM based DB.

Bug fix:

• [Temporary] Check max version across all tables in Get (would be removed in v2.0).
• Update commit and read ts while loading from backup.
• Ensure all transaction entries are part of the same value log file.
• On commit, run unlock callbacks before doing writes (#413).
• Wait for goroutines to finish before closing iterators (#421).

BadgerDB v1.3.0

• Add DB.GetSequence() method to generate monotonically increasing integer
  sequences.
• Add DB.Size() method to return the size of LSM and value log files.
• Tweaked mmap code to make Windows 32-bit builds work.
• Tweaked build tags on some files to make iOS builds work.
• Fix DB.PurgeOlderVersions() to not violate some constraints.

BadgerDB v1.2.0

Version bump to v1.2.0

Badger v1.1.1

• Fix bug where txn.Get was returing key deleted in same transaction.
• Fix race condition while decrementing reference in oracle.
• Update doneCommit in the callback for CommitAsync.
• Iterator sees writes of current transaction.

Badger v1.1.0

• Create Badger directory if it does not exist when badger.Open is called.
• Added Item.ValueCopy() to avoid deadlocks in long-running iterations
• Fixed 64-bit alignment issues to make Badger run on Arm v7

Badger v1.0.1

This release contains fix for #308 .

Badger v1.0.0

Update README with v1.0.0 announcement