Prepare 4.0.0 (#62)

Author: vweevers

CHANGELOG.md

@@ -1,7 +1,39 @@
 # Changelog
 
+_**If you are upgrading:** please see [`UPGRADING.md`](UPGRADING.md)._
+
 ## [Unreleased][unreleased]
 
+## [4.0.0] - 2019-04-06
+
+### Changed
+
+- Upgrade `abstract-leveldown` from `^5.0.0` to `^6.0.2` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `encoding-down` from `^5.0.3` to `^6.0.1` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `levelup` from `^3.0.1` to `^4.0.1` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Avoid unnecessary copy of batch operations ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Invoke abstract tests from single function ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Add mandatory `db` argument to abstract iterator ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `memdown` devDependency from `^3.0.0` to `^4.0.0` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `nyc` devDependency from `^12.0.2` to `^13.3.0` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `standard` devDependency from `^11.0.1` to `^12.0.1` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Apply common project tweaks ([#58](https://github.com/level/subleveldown/issues/58), [#59](https://github.com/level/subleveldown/issues/59)) ([**@vweevers**](https://github.com/vweevers))
+
+### Added
+
+- Test that errors from `open()` and iterators bubble up ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Test without a user-provided `levelup` layer ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Gitignore `coverage` directory ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+
+### Removed
+
+- Remove obsolete `_batch()` checks ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Remove dummy location from `abstract-leveldown` constructor call ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+
+### Fixed
+
+- Serialize non-buffer keys to strings ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+
 ## [3.0.1] - 2018-07-27
 
 ### Added
@@ -145,7 +177,9 @@
 
 :seedling: Initial release.
 
-[unreleased]: https://github.com/level/subleveldown/compare/v3.0.1...HEAD
+[unreleased]: https://github.com/level/subleveldown/compare/v4.0.0...HEAD
+
+[4.0.0]: https://github.com/level/subleveldown/compare/v3.0.1...v4.0.0
 
 [3.0.1]: https://github.com/level/subleveldown/compare/v3.0.0...v3.0.1
 

README.md

@@ -1,6 +1,6 @@
 # subleveldown
 
-> Sublevels on top of [`levelup`][levelup] with different encodings for each sublevel.
+> Split a [`levelup`][levelup] database into _sublevels_ with their own keyspace, encoding and events.
 
 [![level badge][level-badge]](https://github.com/Level/awesome)
 [![npm](https://img.shields.io/npm/v/subleveldown.svg?label=&logo=npm)](https://www.npmjs.com/package/subleveldown)

UPGRADING.md

@@ -2,6 +2,15 @@
 
 This document describes breaking changes and how to upgrade. For a complete list of changes including minor and patch releases, please refer to the [changelog](CHANGELOG.md).
 
+## v4
+
+Upgraded to `abstract-leveldown@6`, `encoding-down@6` and `levelup@4`. We recommend to pair `subleveldown@4` with `level` >= 5 or when using a custom store, one that is based on `abstract-leveldown` >= 6. For details please see:
+
+- [`abstract-leveldown/UPGRADING.md`](https://github.com/Level/abstract-leveldown/blob/master/UPGRADING.md)
+- [`levelup/UPGRADING.md`](https://github.com/Level/levelup/blob/master/UPGRADING.md)
+
+A quick summary: range options are now serialized the same as keys, `db.iterator({ gt: undefined })` is not the same as `db.iterator({})`, nullish values are now rejected and streams are backed by [`readable-stream@3`](https://github.com/nodejs/readable-stream#version-3xx).
+
 ## v3
 
 Dropped support for node 4.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "subleveldown",
   "version": "3.0.1",
-  "description": "sublevels implemented using leveldowns",
+  "description": "Split a levelup database into sublevels with their own keyspace, encoding and events",
   "author": "Mathias Buus (@mafintosh)",
   "license": "MIT",
   "main": "index.js",