Fixed #922: PHP 7.4 compatibility. (#923)

Author: danepowell

src/Common/ExecTrait.php

@@ -70,43 +70,43 @@ abstract public function getCommandDescription();
      * @see \Robo\Common\ProgressIndicatorAwareTrait
      * @see \Robo\Common\Timer
      */
-    abstract public function startTimer();
+    abstract protected function startTimer();
 
     /**
      * @see \Robo\Common\ProgressIndicatorAwareTrait
      * @see \Robo\Common\Timer
      */
-    abstract public function stopTimer();
+    abstract protected function stopTimer();
 
     /**
      * @return null|float
      *
      * @see \Robo\Common\ProgressIndicatorAwareTrait
      * @see \Robo\Common\Timer
      */
-    abstract public function getExecutionTime();
+    abstract protected function getExecutionTime();
 
     /**
      * @return bool
      *
      * @see \Robo\Common\TaskIO
      */
-    abstract public function hideTaskProgress();
+    abstract protected function hideTaskProgress();
 
     /**
      * @param bool $inProgress
      *
      * @see \Robo\Common\TaskIO
      */
-    abstract public function showTaskProgress($inProgress);
+    abstract protected function showTaskProgress($inProgress);
 
     /**
      * @param string $text
      * @param null|array $context
      *
      * @see \Robo\Common\TaskIO
      */
-    abstract public function printTaskInfo($text, $context = null);
+    abstract protected function printTaskInfo($text, $context = null);
 
     /**
      * @return bool