added --prefer-dist option to require command

src/Composer/Command/RequireCommand.php

@@ -36,6 +36,7 @@ class RequireCommand extends InitCommand
                 new InputArgument('packages', InputArgument::IS_ARRAY | InputArgument::OPTIONAL, 'Required package with a version constraint, e.g. foo/bar:1.0.0 or foo/bar=1.0.0 or "foo/bar 1.0.0"'),
                 new InputOption('dev', null, InputOption::VALUE_NONE, 'Add requirement to require-dev.'),
                 new InputOption('prefer-source', null, InputOption::VALUE_NONE, 'Forces installation from package sources when possible, including VCS information.'),
+                new InputOption('prefer-dist', null, InputOption::VALUE_NONE, 'Forces installation from package dist even for dev versions.'),
                 new InputOption('no-update', null, InputOption::VALUE_NONE, 'Disables the automatic update of the dependencies.'),
             ))
             ->setHelp(<<<EOT
@@ -98,6 +99,7 @@ EOT
         $install
             ->setVerbose($input->getOption('verbose'))
             ->setPreferSource($input->getOption('prefer-source'))
+            ->setPreferDist($input->getOption('prefer-dist'))
             ->setDevMode($input->getOption('dev'))
             ->setUpdate(true)
             ->setUpdateWhitelist($requirements);