[Docs] Update changelog and bump version

Author: lindyhopchris

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-alpha.3] - 2021-02-09
 
 ### Added
 
@@ -16,14 +16,19 @@ All notable changes to this project will be documented in this file. This projec
   should be used to add conditional relationships.
 - [#13](https://github.com/laravel-json-api/laravel/issues/13) Added French translations for JSON:API errors generated
   by specification parsing and resource/query parameter validation.
+- [#7](https://github.com/laravel-json-api/laravel/issues/7) Eloquent schemas now support default eager loading via
+  their `$with` property.
+- [#15](https://github.com/laravel-json-api/laravel/issues/15) When parsing a JSON:API document for compliance with the
+  specification, the client will now receive a clearer error message if they submit a *to-one* relationship object for a
+  *to-many* relationship (and vice-versa).
 
 ### Changed
 
 - [#2](https://github.com/laravel-json-api/laravel/issues/2) **BREAKING** Improved the extraction of existing resource
   field values when constructing validation data for update requests:
     - The `existingAttributes()` and `existingRelationships()` methods on the resource request class has been removed.
       If you need to modify the existing values before the client values are merged, implement the `withExisting()`
-      method instead. This receives the model its JSON representation (as an array).
+      method instead. This receives the model and its JSON representation (as an array).
     - The `mustValidate()` method must now be called on a schema relationship field. (Previously this was on the
       resource relation.) By default, belongs-to and morph-to relations will be included when extracting existing
       values; all other relations will not. Use the `mustValidate()` or `notValidated()` method on the schema relation

README.md

@@ -1,3 +1,5 @@
+![Tests](https://github.com/laravel-json-api/laravel/workflows/Tests/badge.svg)
+
 # JSON:API for Web Artisans
 
 Implement feature-rich [JSON:API](https://jsonapi.org) compliant APIs in your