Merge pull request #206 from demeritcowboy/execute

Crash with core:install - typeerror on return value from execute()

src/Command/CoreInstallCommand.php

@@ -77,6 +77,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     if ($output->getVerbosity() > OutputInterface::VERBOSITY_NORMAL) {
       $output->writeln(Encoder::encode($setup->getModel()->getValues(), 'json-pretty'));
     }
+    return 0;
   }
 
   /**