Fix git shortening, it is sunday..

src/Composer/Downloader/GitDownloader.php

@@ -496,7 +496,7 @@ class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface
     protected function getShortHash($reference)
     {
         if (!$this->io->isVerbose() && preg_match('{^[0-9a-f]{40}$}', $reference)) {
-            return substr($reference, 10);
+            return substr($reference, 0, 10);
         }
 
         return $reference;

tests/Composer/Test/Fixtures/functional/create-project-command.test

@@ -2,7 +2,7 @@
 create-project seld/jsonlint %testDir% 1.0.0 --prefer-source -n
 --EXPECT-ERROR--
 Installing seld/jsonlint (1.0.0)
-  - Installing seld/jsonlint (1.0.0) Cloning 3b4bc2a96ff5d3fe6866bfe9dd0c845246705791
+  - Installing seld/jsonlint (1.0.0) Cloning 3b4bc2a96f
 Created project in %testDir%
 Loading composer repositories with package information
 Updating dependencies (including require-dev)