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Defines the maximum age (in seconds) of a resultset to still be included in merged results.
i.e. If you run cucumber features, then later rake test, if the stored cucumber resultset is
more seconds ago than specified here, it won't be taken into account when merging (and is also
purged from the resultset cache)
Of course, this only applies when merging is active (e.g. SimpleCov.use_merging is not false!)
Default is 600 seconds (10 minutes)
Configure with SimpleCov.merge_timeout(3600) # 1hr