Pierre-Yves David <pierre-yves.david@octobus.net> [Tue, 28 Aug 2018 20:00:46 +0200] rev 4034
obshashrange: force obshashrange invalidation by bumping schema
The fix in 8.1.1 deserve recomputing the obs hash range cache. So we bump its
schema version to declare the older cache invalid. The other caches, including
the expensive stablerange are unaffected.