Report:write compatibility fix (#27)

* Report:write compatibility fix

Compatibility with PHPUnit 7.0+
Declaration of Codeception\PHPUnit\ResultPrinter\Report::write($buffer): void should be compatible with PHPUnit\Util\Printer::write(string $buffer): void

* Update ConsolePrinter.php

Author: ibpavlov

src/ConsolePrinter.php

@@ -9,7 +9,7 @@
  */
 interface ConsolePrinter
 {
-    public function write($buffer);
+    public function write(string $buffer);
 
     public function printResult(\PHPUnit\Framework\TestResult $result);
 }

src/ResultPrinter/Report.php

@@ -57,8 +57,8 @@ public function printResult(\PHPUnit\Framework\TestResult $result)
     {
     }
 
-    public function write($buffer) : void
+    public function write(string $buffer) : void
     {
-		parent::write($buffer);
+        parent::write($buffer);
     }
 }