chore: prepare 8.4.0 release

Author: mfn

CHANGELOG.md

@@ -1,8 +1,11 @@
 CHANGELOG
 =========
 
-[Next release](https://github.com/rebing/graphql-laravel/compare/8.3.0...master)
+[Next release](https://github.com/rebing/graphql-laravel/compare/8.4.0...master)
 --------------
+
+2022-06-11, 8.4.0
+-----------------
 ### Added
 - Register directives via schema config [\#947 / sforward](https://github.com/rebing/graphql-laravel/pull/947)
 

composer.json

@@ -77,7 +77,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "8.3-dev"
+            "dev-master": "8.4-dev"
         },
         "laravel": {
             "providers": [