Redundant override of PositionableStream>>#peek:

[LinqLover]

Since Collections-ct.1026 (Squeak 6.1Alpha), PositionableStream>>#peek: is in the Trunk. Unfortunately, FileSystem-Git still overrides it, causing my working copy for Collections not to be empty. This method should either be moved into a compatibility package or at least into a category with an -override suffix.