fix laravel version

Author: yushing

composer.json

@@ -22,7 +22,7 @@
         }
     ],
     "require": {
-        "illuminate/database": ">=5.*"
+        "illuminate/database": ">=5.8.0"
     },
     "require-dev": {
         "orchestra/testbench": "3.*",

src/EloquentJoinBuilder.php

@@ -199,9 +199,9 @@ private function performJoin($relations, $leftJoin = null)
             if (!in_array($relationAccumulatedString, $this->joinedTables)) {
                 $joinQuery = $relatedTable.($this->useTableAlias ? ' as '.$relatedTableAlias : '');
                 if ($relatedRelation instanceof BelongsTo) {
-                    $relatedKey = $relatedRelation->getQualifiedForeignKey();
+                    $relatedKey = $relatedRelation->getQualifiedForeignKeyName();
                     $relatedKey = last(explode('.', $relatedKey));
-                    $ownerKey = $relatedRelation->getOwnerKey();
+                    $ownerKey = $relatedRelation->getOwnerKeyName();
 
                     $this->$joinMethod($joinQuery, function ($join) use ($relatedRelation, $relatedTableAlias, $relatedKey, $currentTableAlias, $ownerKey) {
                         $join->on($relatedTableAlias.'.'.$ownerKey, '=', $currentTableAlias.'.'.$relatedKey);

tests/TestCase.php

@@ -9,7 +9,7 @@
 
 abstract class TestCase extends \Orchestra\Testbench\TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();