Merge pull request #19 from colinodell/feature/random-unique-paths

Use uniqid() to avoid collisions in backup paths

src/PathPreserver.php

@@ -99,7 +99,7 @@ public function preserve()
                 continue;
             }
 
-            $unique = $installPath.' '.time();
+            $unique = $installPath.' '.uniqid('', true);
             $cacheRoot = $this->filesystem->normalizePath($this->cacheDir.'/preserve-paths/'.sha1($unique));
             $this->filesystem->ensureDirectoryExists($cacheRoot);