Add support for Symfony 5

Command/Cleanup.php

@@ -50,7 +50,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
 
     if ($confirmation != 'delete') {
       print "Clean up aborted.\n";
-      return;
+      return 0;
     }
 
     $master_branch_name = $master_branch->getBranchName();

Command/LocalSetup.php

@@ -63,7 +63,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
         $output->writeln("Afterwards, you should use the update command to get new patches from drupal.org.");
       }
 
-      return;
+      return 0;
     }
 
     // If the master branch is not current, abort.
@@ -89,7 +89,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     // If no patches, we're done.
     if (empty($patches)) {
       $output->writeln("There are no patches to apply.");
-      return;
+      return 0;
     }
 
     // Output the patches.

Command/LocalUpdate.php

@@ -59,7 +59,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     // If no patches, we're done.
     if (empty($patches)) {
       print "No patches to apply.\n";
-      return;
+      return 0;
     }
 
     $patches_uncommitted = [];
@@ -86,7 +86,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     // If no uncommitted patches, we're done.
     if (empty($patches_uncommitted)) {
       print "No patches to apply; existing patches are already applied to this feature branch.\n";
-      return;
+      return 0;
     }
 
     // If the feature branch's SHA is not the same as the last committed patch
@@ -134,7 +134,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     // If all the patches were already committed, we're done.
     if (empty($patches_committed)) {
       print "No new patches to apply.\n";
-      return;
+      return 0;
     }
 
     // If final patch didn't apply, then output a message: the latest patch

Command/Purge.php

@@ -73,7 +73,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
 
     if (empty($issues_to_clean_up)) {
       print "No branches to clean up.\n";
-      return;
+      return 0;
     }
 
     // Sort by issue number.
@@ -102,7 +102,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     $question = new Question("Please enter 'delete' to confirm DELETION of {$count} branches:");
     if ($helper->ask($input, $output, $question) != 'delete') {
       $output->writeln('Clean up aborted.');
-      return;
+      return 0;
     }
 
     foreach ($issues_to_clean_up as $issue_number => $info) {

composer.json

@@ -4,8 +4,8 @@
   "homepage": "https://github.com/joachim-n/dorgflow",
   "license": "GPL-2.0+",
   "require": {
-    "symfony/dependency-injection": ">=3.2 <5",
-    "symfony/console": ">=3.2 <5"
+    "symfony/dependency-injection": ">=3.2",
+    "symfony/console": ">=3.2"
   },
   "require-dev": {
     "phpunit/phpunit": ">=6.0",