bump pre version

Author: dodo

package.json

@@ -1,6 +1,6 @@
 { "name": "bufferstream"
 , "description": "painless stream buffering and cutting"
-, "version": "0.5.0-pre"
+, "version": "0.5.0-pre2"
 , "homepage": "https://github.com/dodo/node-bufferstream"
 , "author": "dodo (https://github.com/dodo)"
 , "repository": {"type": "git", "url": "git://github.com/dodo/node-bufferstream.git"}