[Docs] Update changelog and readme, bump version

Author: lindyhopchris

Diff for: CHANGELOG.md

@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file. This project adheres to
 [Semantic Versioning](http://semver.org/) and [this changelog format](http://keepachangelog.com/).
 
-## Unreleased
+## [1.0.0] - 2021-07-31
 
 ### Added
 

Diff for: README.md

@@ -19,6 +19,16 @@ composer require laravel-json-api/laravel
 
 See our documentation for further installation instructions.
 
+## Upgrading
+
+When upgrading you typically want to upgrade this package and all our related packages. This is the recommended way:
+
+```bash
+composer require laravel-json-api/laravel --no-update
+composer require laravel-json-api/testing --dev --no-update
+composer up laravel-json-api/* cloudcreativity/json-api-testing
+```
+
 ## Example Application
 
 To view an example Laravel application that uses this package, see the