[travis] Fix deps=low/high builds

Author: nicolas-grekas

.github/travis.php

@@ -46,8 +46,8 @@
     $versions = file_get_contents('https://packagist.org/packages/'.$package->name.'.json');
     $versions = json_decode($versions);
 
-    foreach ($versions->package->versions as $version => $package) {
-        $packages[$package->name] += array($version => $package);
+    foreach ($versions->package->versions as $v => $package) {
+        $packages[$package->name] += array($v => $package);
     }
 }