update setup

• build: remove composer.lock from template
• build: add WP Desk as package author
• build: declare latest low support version
• build: remove composer's platform check
• build: add phpstan as direct dependency/update phpunit
• refactor: update phpunit setup and example test
• build: update phpstan config

tests/unit/ExampleTest.php

@@ -9,14 +9,14 @@ use WP_Mock\Tools\TestCase;
 class ExampleTest extends TestCase {
 	// private $test_class_under_tests;
 
-	public function setUp() {
+	public function setUp(): void {
 		WP_Mock::setUp();
 
 //		$example = Mockery::mock( class );
 //		$this->test_class_under_tests =
 	}
 
-	public function tearDown() {
+	public function tearDown(): void {
 		WP_Mock::tearDown();
 	}
 //