release 0.4.0 (#501)

Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
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Krasi Georgiev 2019-01-18 11:42:59 +03:00 committed by GitHub
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## master / unreleased
## 0.4.0
- [CHANGE] New `WALSegmentSize` option to override the `DefaultOptions.WALSegmentSize`. Added to allow using smaller wal files. For example using tmpfs on a RPI to minimise the SD card wear out from the constant WAL writes. As part of this change the `DefaultOptions.WALSegmentSize` constant was also exposed.
- [CHANGE] Empty blocks are not written during compaction [#374](https://github.com/prometheus/tsdb/pull/374)
- [FEATURE] Size base retention through `Options.MaxBytes`. As part of this change: