docs: Update changelog.

CHANGELOG.md

@@ -5,6 +5,31 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased](https://github.com/loophp/collection/compare/2.5.5...HEAD)
+
+### Commits
+
+- **Breaking change:** refactor: Update Explode operation. [`5f15043`](https://github.com/loophp/collection/commit/5f15043d3ffefce38b4a0fd9248ba48a450ab38c)
+- **Breaking change:** refactor: Update Split operation. [`a3d93de`](https://github.com/loophp/collection/commit/a3d93de7a848a8b63c0503e06cadce351760c7ac)
+- feat: Add fromFile static constructor. [`64b2f4c`](https://github.com/loophp/collection/commit/64b2f4cb1a3bb706fc6585fe0330cfca54ecbea7)
+- feat: Add Words operation. [`873d5ec`](https://github.com/loophp/collection/commit/873d5ec05ed1967ecb12933018343c3ff52f57e8)
+- feat: Add Unwords operation. [`3b0d239`](https://github.com/loophp/collection/commit/3b0d2399a0a20669b0790f35380e2bce4b167c71)
+- feat: Add Unlines operation. [`5b20804`](https://github.com/loophp/collection/commit/5b20804c3b5d88297c1021332be38d4df904b67f)
+- feat: Add Lines operation. [`107cbb5`](https://github.com/loophp/collection/commit/107cbb54991a6a3f3ba2d685f29fc89a88c3a4bf)
+- refactor: Refactor operations using their parent operation counterpart. [`b4ea8cd`](https://github.com/loophp/collection/commit/b4ea8cda5e03ba39a84577e4b77dcc9c020e0363)
+- refactor: Update Reverse operation. [`22865fe`](https://github.com/loophp/collection/commit/22865fe5da69243c4e26174909374304af667947)
+- feat: Add scanLeft1 operation. [`12acf13`](https://github.com/loophp/collection/commit/12acf139b22509d7b1dac78529d75a123f6298fe)
+- feat: Add scanRight1 operation. [`d12fa54`](https://github.com/loophp/collection/commit/d12fa544e69537cd8300bc7dd1664f5c22db6970)
+- feat: Add scanRight operation. [`a8dc9a5`](https://github.com/loophp/collection/commit/a8dc9a583c1b9bc57ff389c9cc779fd585091b41)
+- docs: Update FoldLeft and FoldRight. [`98ced08`](https://github.com/loophp/collection/commit/98ced08469e7f019d80010900fdb5c650fabb261)
+- feat: Add scanLeft operation. [`174e370`](https://github.com/loophp/collection/commit/174e370ee395913e452010281f6531182a27b274)
+- docs: Update annotations. [`317483e`](https://github.com/loophp/collection/commit/317483e966c6005e9c306d7534492c440bb2008e)
+- feat: Add FoldRight1 operation. [`18b9b1d`](https://github.com/loophp/collection/commit/18b9b1d00cb7fa7d60d48c18b4e8e9051d68aa0c)
+- feat: Add FoldLeft1 operation. [`c034101`](https://github.com/loophp/collection/commit/c0341016cd93348cde87f0f91b4fde40355b64db)
+- docs: Update README. [`ecdbc18`](https://github.com/loophp/collection/commit/ecdbc185ff631a3e2c17645fb3fdf90b98ea0a68)
+- docs: Update documentation. [`7985455`](https://github.com/loophp/collection/commit/79854557747c1807403c26909c8ece0225b55500)
+- docs: Update API page. [`516f786`](https://github.com/loophp/collection/commit/516f786bad6985fc01da1d447002c033810f47ea)
+
 ## [2.5.5](https://github.com/loophp/collection/compare/2.5.4...2.5.5) - 2020-09-16
 
 ### Merged
@@ -15,6 +40,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Commits
 
 - chore: Update composer.json. [`92f9ed8`](https://github.com/loophp/collection/commit/92f9ed849e4d066b2a1e3104d5de3123d60b217b)
+- docs: Update changelog. [`091c97c`](https://github.com/loophp/collection/commit/091c97ccafdd3e7a44df7ca99ffad9aae68bfe6e)
 - feat: Add Unwindow operation. [`e240e6a`](https://github.com/loophp/collection/commit/e240e6a83e4d80879c971b4c6238b59bb97ff81d)
 
 ## [2.5.4](https://github.com/loophp/collection/compare/2.5.3...2.5.4) - 2020-09-14