add endpoint for server-side exclude setting

tests/Endpoints/ZoneSettingsTest.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+use Cloudflare\API\Adapter\Adapter;
+use Cloudflare\API\Endpoints\ZoneSettings;
+
+class ZoneSettingsTest extends TestCase
+{
+    public function testGetServerSideExcludeSetting()
+    {
+        $response = $this->getPsr7JsonResponseForFixture('Endpoints/getServerSideExclude.json');
+
+        $mock = $this->getMockBuilder(Adapter::class)->getMock();
+        $mock->method('get')->willReturn($response);
+
+        $mock->expects($this->once())->method('get');
+
+        $zones = new ZoneSettings($mock);
+        $result = $zones->getServerSideExcludeSetting('023e105f4ecef8ad9ca31a8372d0c353');
+
+        $this->assertSame('on', $result);
+    }
+
+    public function testUpdateServerSideExcludeSetting()
+    {
+        $response = $this->getPsr7JsonResponseForFixture('Endpoints/updateServerSideExclude.json');
+
+        $mock = $this->getMockBuilder(Adapter::class)->getMock();
+        $mock->method('patch')->willReturn($response);
+
+        $mock->expects($this->once())->method('patch');
+
+        $zones = new ZoneSettings($mock);
+        $result = $zones->updateServerSideExcludeSetting('023e105f4ecef8ad9ca31a8372d0c353', 'on');
+
+        $this->assertSame('on', $result);
+    }
+}

tests/Fixtures/Endpoints/getServerSideExclude.json

@@ -0,0 +1,11 @@
+{
+  "success": true,
+  "errors": [],
+  "messages": [],
+  "result": {
+    "id": "server_side_exclude",
+    "value": "on",
+    "editable": true,
+    "modified_on": "2014-01-01T05:20:00.12345Z"
+  }
+}

tests/Fixtures/Endpoints/updateServerSideExclude.json

@@ -0,0 +1,11 @@
+{
+  "success": true,
+  "errors": [],
+  "messages": [],
+  "result": {
+    "id": "server_side_exclude",
+    "value": "on",
+    "editable": true,
+    "modified_on": "2014-01-01T05:20:00.12345Z"
+  }
+}