Replace usage of brackets by legacy array notation

tests/Composer/Test/Package/Version/VersionGuesserTest.php

@@ -62,7 +62,7 @@ class VersionGuesserTest extends \PHPUnit_Framework_TestCase
         $config = new Config;
         $config->merge(array('repositories' => array('packagist' => false)));
         $guesser = new VersionGuesser($executor, new VersionParser());
-        $version = $guesser->guessVersion($config, []);
+        $version = $guesser->guessVersion($config, array());
 
         $this->assertEquals("dev-$commitHash", $version);
     }
@@ -101,7 +101,7 @@ class VersionGuesserTest extends \PHPUnit_Framework_TestCase
         $config = new Config;
         $config->merge(array('repositories' => array('packagist' => false)));
         $guesser = new VersionGuesser($executor, new VersionParser());
-        $version = $guesser->guessVersion($config, []);
+        $version = $guesser->guessVersion($config, array());
 
         $this->assertEquals("2.0.5.0-alpha2", $version);
     }
@@ -151,7 +151,7 @@ class VersionGuesserTest extends \PHPUnit_Framework_TestCase
         $config = new Config;
         $config->merge(array('repositories' => array('packagist' => false)));
         $guesser = new VersionGuesser($executor, new VersionParser());
-        $version = $guesser->guessVersion($config, []);
+        $version = $guesser->guessVersion($config, array());
 
         $this->assertEquals("dev-foo", $version);
     }