update to lumen 7

tests/unit/AbcParser/Domain/Modules/Interpreter/ContextTest.php

@@ -34,7 +34,7 @@ class ContextTest extends PHPUnit_Framework_TestCase
 
         $this->assertGreaterThan(1, count($context));
         foreach ($context as $key => $line) {
-            $this->assertInternalType('string', $line);
+            $this->assertIsString($line);
         }
     }
 

tests/unit/AbcParser/Domain/Modules/Interpreter/DefaultInterpreterTest.php

@@ -26,7 +26,7 @@ class DefaultInterpreterTest extends PHPUnit_Framework_TestCase
      */
     protected $interpreter;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $builder = new Builder();
         $this->interpreter = new DefaultInterpreter($builder);