docs: add changelogs for 2.3.{6,7,8} and 2.4.{1,2,3} (#10494)

* docs: add changelogs for 2.3.{6,7} and 2.4.{1,2}

* docs: add changelogs for 2.4.3 beta and 2.3.8 stable

* Update docs/CHANGELOG-2.3.md

Co-Authored-By: soc1c <47772477+soc1c@users.noreply.github.com>

* Update docs/CHANGELOG-2.3.md

Co-Authored-By: soc1c <47772477+soc1c@users.noreply.github.com>

* docs: remove empty lines

CHANGELOG.md

@@ -1,3 +1,37 @@
+## Parity-Ethereum [v2.4.3](https://github.com/paritytech/parity-ethereum/releases/tag/v2.4.3) (2019-03-22)
+
+Parity-Ethereum 2.4.3-beta is a bugfix release that improves performance and stability. This patch release contains a critical bug fix where serving light clients previously led to client crashes. Upgrading is highly recommended.
+
+The full list of included changes:
+- 2.4.3 beta backports ([#10508](https://github.com/paritytech/parity-ethereum/pull/10508))
+  - Version: bump beta
+  - Add additional request tests ([#10503](https://github.com/paritytech/parity-ethereum/pull/10503))
+
+## Parity-Ethereum [v2.4.2](https://github.com/paritytech/parity-ethereum/releases/tag/v2.4.2) (2019-03-20)
+
+Parity-Ethereum 2.4.2-beta is a bugfix release that improves performance and stability.
+
+The full list of included changes:
+- 2.4.2 beta backports ([#10488](https://github.com/paritytech/parity-ethereum/pull/10488))
+  - Version: bump beta
+  - Сaching through docker volume ([#10477](https://github.com/paritytech/parity-ethereum/pull/10477))
+  - fix win&mac build ([#10486](https://github.com/paritytech/parity-ethereum/pull/10486))
+  - fix(extract `timestamp_checked_add` as lib) ([#10383](https://github.com/paritytech/parity-ethereum/pull/10383))
+
+## Parity-Ethereum [v2.4.1](https://github.com/paritytech/parity-ethereum/releases/tag/v2.4.1) (2019-03-19)
+
+Parity-Ethereum 2.4.1-beta is a bugfix release that improves performance and stability.
+
+The full list of included changes:
+- 2.4.1 beta backports ([#10471](https://github.com/paritytech/parity-ethereum/pull/10471))
+  - Version: bump beta
+  - Implement parity_versionInfo & parity_setChain on LC; fix parity_setChain ([#10312](https://github.com/paritytech/parity-ethereum/pull/10312))
+  - CI publish to aws ([#10446](https://github.com/paritytech/parity-ethereum/pull/10446))
+  - CI aws git checkout ([#10451](https://github.com/paritytech/parity-ethereum/pull/10451))
+  - Revert "CI aws git checkout ([#10451](https://github.com/paritytech/parity-ethereum/pull/10451))" ([#10456](https://github.com/paritytech/parity-ethereum/pull/10456))
+  - Tests parallelized ([#10452](https://github.com/paritytech/parity-ethereum/pull/10452))
+  - Ensure static validator set changes are recognized ([#10467](https://github.com/paritytech/parity-ethereum/pull/10467))
+
 ## Parity-Ethereum [v2.4.0](https://github.com/paritytech/parity-ethereum/releases/tag/v2.4.0) (2019-02-25)
 
 Parity-Ethereum 2.4.0-beta is our trifortnightly minor version release coming with a lot of new features as well as bugfixes and performance improvements.

docs/CHANGELOG-2.3.md

@@ -1,3 +1,36 @@
+## Parity-Ethereum [v2.3.8](https://github.com/paritytech/parity-ethereum/releases/tag/v2.3.8) (2019-03-22)
+
+Parity-Ethereum 2.3.8-stable is a bugfix release that improves performance and stability. This patch release contains a critical bug fix where serving light clients previously led to client crashes. Upgrading is highly recommended.
+
+The full list of included changes:
+- 2.3.8 stable backports ([#10507](https://github.com/paritytech/parity-ethereum/pull/10507))
+  - Version: bump stable
+  - Add additional request tests ([#10503](https://github.com/paritytech/parity-ethereum/pull/10503))
+
+## Parity-Ethereum [v2.3.7](https://github.com/paritytech/parity-ethereum/releases/tag/v2.3.7) (2019-03-20)
+
+Parity-Ethereum 2.3.7-stable is a bugfix release that improves performance and stability.
+
+The full list of included changes:
+- 2.3.7 stable backports ([#10487](https://github.com/paritytech/parity-ethereum/pull/10487))
+  - Version: bump stable
+  - Сaching through docker volume ([#10477](https://github.com/paritytech/parity-ethereum/pull/10477))
+  - fix win&mac build ([#10486](https://github.com/paritytech/parity-ethereum/pull/10486))
+  - fix(extract `timestamp_checked_add` as lib) ([#10383](https://github.com/paritytech/parity-ethereum/pull/10383))
+
+## Parity-Ethereum [v2.3.6](https://github.com/paritytech/parity-ethereum/releases/tag/v2.3.6) (2019-03-19)
+
+Parity-Ethereum 2.3.6-stable is a bugfix release that improves performance and stability.
+
+The full list of included changes:
+- 2.3.6 stable backports ([#10470](https://github.com/paritytech/parity-ethereum/pull/10470))
+  - Version: bump stable
+  - CI publish to aws ([#10446](https://github.com/paritytech/parity-ethereum/pull/10446))
+  - Ensure static validator set changes are recognized ([#10467](https://github.com/paritytech/parity-ethereum/pull/10467))
+  - CI aws git checkout ([#10451](https://github.com/paritytech/parity-ethereum/pull/10451))
+  - Revert "CI aws git checkout ([#10451](https://github.com/paritytech/parity-ethereum/pull/10451))" ([#10456](https://github.com/paritytech/parity-ethereum/pull/10456))
+  - Tests parallelized ([#10452](https://github.com/paritytech/parity-ethereum/pull/10452))
+
 ## Parity-Ethereum [v2.3.5](https://github.com/paritytech/parity-ethereum/releases/tag/v2.3.5) (2019-02-25)
 
 Parity-Ethereum 2.3.5-stable is a bugfix release that improves performance and stability.