Update changelog.

CHANGELOG.md

@@ -2,10 +2,30 @@
 
 All notable changes to this project will be documented in this file. Dates are displayed in UTC.
 
+#### [2.4.0](https://github.com/loophp/collection/compare/2.3.5...2.4.0)
+
+> 7 September 2020
+
+- Add Unzip operation. [`cad956f`](https://github.com/loophp/collection/commit/cad956fd1bc34ea04b01f1804165178fc8b82123)
+- Add TakeWhile operation. [`c9e6701`](https://github.com/loophp/collection/commit/c9e6701463709c112d1ee3dab8fc76d54c62dcd0)
+- Rename Skip into Drop. [`0c6b01a`](https://github.com/loophp/collection/commit/0c6b01ae505c00baebe9cfc53c11ec698c3a39d4)
+- Add DropWhile operation. [`cf816a3`](https://github.com/loophp/collection/commit/cf816a3d6c861520accfe7cec443229b3e2c8148)
+- Update FoldLeft operation. [`deb825d`](https://github.com/loophp/collection/commit/deb825d3b3b0dd1233ff3c5d8481f10a01d03b9c)
+- Update Last operation. [`4ae3d35`](https://github.com/loophp/collection/commit/4ae3d3593f3f88f9f35da06ca31b589b5d8092a2)
+- Update First operation. [`79a1f5c`](https://github.com/loophp/collection/commit/79a1f5cd6b5ebc14e403df9c82a395a0896a044c)
+- Update Reduction operation. [`f20942c`](https://github.com/loophp/collection/commit/f20942c5055e111c201acb7d3fd6103336fb0cb6)
+- Add Current operation. [`ed246ed`](https://github.com/loophp/collection/commit/ed246edadd6eedd8e6a347af3552119f2b7fbff4)
+- Add Key operation. [`24fa777`](https://github.com/loophp/collection/commit/24fa7772b94abc786459491e899eb482e97dd7fb)
+- Update PHPCS comments. [`ce83560`](https://github.com/loophp/collection/commit/ce835608c14587a2519c672f89199e9eec519cf0)
+- Refactor reducer callbacks. [`9d1e176`](https://github.com/loophp/collection/commit/9d1e17606b6422ff8518a53b187105d831140da4)
+- Update annotations. [`1bb45f2`](https://github.com/loophp/collection/commit/1bb45f28ee9ba522545d45e4bf75db5fc4cdb899)
+- Update Associate operation. [`1b9ca3c`](https://github.com/loophp/collection/commit/1b9ca3cd4c19ee873420986a847268c9541a43be)
+
 #### [2.3.5](https://github.com/loophp/collection/compare/2.3.4...2.3.5)
 
 > 3 September 2020
 
+- Update changelog. [`485c0fa`](https://github.com/loophp/collection/commit/485c0fa776b07fa25b6a10ada99b90584926b93b)
 - Update Map operation. [`1521b23`](https://github.com/loophp/collection/commit/1521b23313f74e234f7a5dd09e7b816fc30b3eb4)
 
 #### [2.3.4](https://github.com/loophp/collection/compare/2.3.3...2.3.4)
@@ -477,7 +497,7 @@ All notable changes to this project will be documented in this file. Dates are d
 - Add the Cycle operation. [`b82b610`](https://github.com/loophp/collection/commit/b82b610126f5a90e6ac2cafd79be863c13588747)
 - Update README. [`6f4cddf`](https://github.com/loophp/collection/commit/6f4cddf7363e41a67a4c59df179138590f8cd063)
 
-#### [0.0.12](https://github.com/loophp/collection/compare/0.0.11...0.0.12)
+#### [0.0.12](https://github.com/loophp/collection/compare/0.0.10...0.0.12)
 
 > 9 September 2019
 
@@ -493,11 +513,6 @@ All notable changes to this project will be documented in this file. Dates are d
 - Add the Split operation. [`2e0dc1a`](https://github.com/loophp/collection/commit/2e0dc1a5002a118f250d61ac52c50e6641496c46)
 - Simplify the times() method. [`6d8014b`](https://github.com/loophp/collection/commit/6d8014bd67c6320741720e66adaa55d52a216d80)
 - Differentiate Operation and Transformation. [`3546cfa`](https://github.com/loophp/collection/commit/3546cfab79a3b7778d9e68027de1f369a01ec003)
-
-#### [0.0.11](https://github.com/loophp/collection/compare/0.0.10...0.0.11)
-
-> 3 September 2019
-
 - Update README. [`3e59719`](https://github.com/loophp/collection/commit/3e59719ce0d86f82a834ff915f3e15fe8e99325a)
 - Fix bug with rebase method. [`72dd937`](https://github.com/loophp/collection/commit/72dd937bbd12950e5064dc71daba59018ec2e931)
 - Update PHPDoc. [`16166ea`](https://github.com/loophp/collection/commit/16166eaf2b235ce4426629a0c325ea0ba83639d9)