bug #709 Fix: symfony/skeleton dev branch (OskarStark)

This PR was merged into the 1.0-dev branch.

Discussion
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Fix: symfony/skeleton dev branch

Extracted from #701

Commits
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c4c6c00 Fix: symfony/skeleton dev branch

Author: weaverryan

src/Test/MakerTestEnvironment.php

@@ -465,7 +465,7 @@ private function getTargetSkeletonVersion(): string
 
                     break;
                 case 'dev':
-                    $this->targetSkeletonVersion = 'dev-master';
+                    $this->targetSkeletonVersion = '5.x-dev';
 
                     break;
                 default: