Update changelog

Author: pmatseykanets

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+## [1.0.0](https://github.com/pmatseykanets/laravel-scout-postgres/releases/tag/v1.0.0) - 2017-09-03
+### Added
+- Added Laravel 5.5 support including package auto discovery.
+
 ## [0.5.0](https://github.com/pmatseykanets/laravel-scout-postgres/releases/tag/v0.5.0) - 2017-01-30
 ### Changed
 - Updated dependencies to support Laravel 5.4 and Scout 3.0