Release notes for 0.4.0

RELEASE_NOTES.md

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+Release 0.4.0 
+------------------------------------
+
+### Highlights 
+
+ * [Spark datasource API](https://uber.github.io/hoodie/quickstart.html#datasource-api) now supported for Copy-On-Write datasets, across all views
+ * BloomIndex can now [prune based on key ranges](https://uber.github.io/hoodie/configurations.html#bloomIndexPruneByRanges) & cut down index tagging time dramatically, for time-prefixed/ordered record keys
+ * Hive sync tool registers RO and RT tables now.
+ * Client application can now specify the partitioner to be used by bulkInsert(), useful for low-level control over initial record placement
+ * Framework for metadata tracking inside IO handles, to implement Spark accumulator-style counters, that are consistent with the timeline
+ * Bug fixes around cleaning, savepoints & upsert's partitioner.
+
+### Full PR List
+
+ * **@gekath** - Writes relative paths to .commit files #184
+ * **@kaushikd49** - Correct clean bug that causes exception when partitionPaths are empty #202
+ * **@vinothchandar** - Refactor HoodieTableFileSystemView using FileGroups & FileSlices #201
+ * **@prazanna** - Savepoint should not create a hole in the commit timeline #207
+ * **@jianxu** - Fix TimestampBasedKeyGenerator in HoodieDeltaStreamer when DATE_STRING is used #211
+ * **@n3nash** - Sync Tool registers 2 tables, RO and RT Tables #210
+ * **@n3nash** - Using FsUtils instead of Files API to extract file extension #213
+ * **@vinothchandar** - Edits to documentation #219
+ * **@n3nash** - Enabled deletes in merge_on_read #218
+ * **@n3nash** - Use HoodieLogFormat for the commit archived log #205
+ * **@n3nash** - fix for cleaning log files in master branch (mor) #228
+ * **@vinothchandar** - Adding range based pruning to bloom index #232
+ * **@n3nash** - Use CompletedFileSystemView instead of CompactedView considering deltacommits too #229
+ * **@n3nash** - suppressing logs (under 4MB) for jenkins #240
+ * **@jianxu** - Add nested fields support for MOR tables #234
+ * **@n3nash** - adding new config to separate shuffle and write parallelism #230
+ * **@n3nash** - adding ability to read archived files written in log format #252
+ * **@ovj** - Removing randomization from UpsertPartitioner #253
+ * **@ovj** - Replacing SortBy with custom partitioner #245
+ * **@esmioley** - Update deprecated hash function #259
+ * **@vinothchandar** - Adding canIndexLogFiles(), isImplicitWithStorage(), isGlobal() to HoodieIndex #268
+ * **@kaushikd49** - Hoodie Event callbacks #251
+ * **@vinothchandar** - Spark Data Source (finally) #266
+
+
+Previous Releases
+------------
+* Refer to [github](https://github.com/uber/hoodie/releases)