Zeal 0.7.0 always asking for updating all the docsets

[Carsampa]

Hi

Zeal 0.7.0 (tested in Windows) is always asking for updating all docsets after refreshing their list.

It seems that's because it is not storing the "revision" field line in files meta.json after each docsets installation. This way we never know when some docset really needs to be updated.

[igsol]

The same in Linux. Several docsets always labeled with "Update available" despite they were updated indeed.

[wdscxsj]

Duplicate of #1559 and already fixed. I wish a new release just for this fix could be published, because the updates are piling up quickly.

Update: My current workaround is to keep two copies of Zeal: v0.6.1 for updating docsets, and v0.7.0 as the viewer. The disk space cost for v0.6.1 is less than 100 MB.

[trollixx]

Duplicate of #1559. It's fixed in the upcoming v0.7.1.