Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/symfony/console/Event/ConsoleErrorEvent.php

@@ -12,7 +12,6 @@
 namespace Symfony\Component\Console\Event;
 
 use Symfony\Component\Console\Command\Command;
-use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
@@ -26,57 +25,33 @@ final class ConsoleErrorEvent extends ConsoleEvent
     private $error;
     private $exitCode;
 
-    public function __construct(InputInterface $input, OutputInterface $output, $error, Command $command = null)
+    public function __construct(InputInterface $input, OutputInterface $output, \Throwable $error, Command $command = null)
     {
         parent::__construct($command, $input, $output);
 
-        $this->setError($error);
-    }
-
-    /**
-     * Returns the thrown error/exception.
-     *
-     * @return \Throwable
-     */
-    public function getError()
-    {
-        return $this->error;
-    }
-
-    /**
-     * Replaces the thrown error/exception.
-     *
-     * @param \Throwable $error
-     */
-    public function setError($error)
-    {
-        if (!$error instanceof \Throwable && !$error instanceof \Exception) {
-            throw new InvalidArgumentException(sprintf('The error passed to ConsoleErrorEvent must be an instance of \Throwable or \Exception, "%s" was passed instead.', \is_object($error) ? \get_class($error) : \gettype($error)));
-        }
-
         $this->error = $error;
     }
 
-    /**
-     * Sets the exit code.
-     *
-     * @param int $exitCode The command exit code
-     */
-    public function setExitCode($exitCode)
+    public function getError(): \Throwable
     {
-        $this->exitCode = (int) $exitCode;
+        return $this->error;
+    }
+
+    public function setError(\Throwable $error): void
+    {
+        $this->error = $error;
+    }
+
+    public function setExitCode(int $exitCode): void
+    {
+        $this->exitCode = $exitCode;
 
         $r = new \ReflectionProperty($this->error, 'code');
         $r->setAccessible(true);
         $r->setValue($this->error, $this->exitCode);
     }
 
-    /**
-     * Gets the exit code.
-     *
-     * @return int The command exit code
-     */
-    public function getExitCode()
+    public function getExitCode(): int
     {
         return null !== $this->exitCode ? $this->exitCode : (\is_int($this->error->getCode()) && 0 !== $this->error->getCode() ? $this->error->getCode() : 1);
     }