Update Changelog.

CHANGELOG.md

@@ -6,6 +6,35 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [1.5.0] - 2018-05-08
+* 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.
+
+## [1.4.0] - 2018-05-04
+* Make mmap-ing of value log optional.
+* Run GC multiple times, based on recorded discard statistics.
+* Add MergeOperator.
+* Force compact L0 on clsoe (#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 (removed in next
+  release).
+* 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).
+
 ## [1.3.0] - 2017-12-12
 * Add `DB.NextSequence()` method to generate monotonically increasing integer
   sequences.