Add note about dbcache to 1.0.15 release notes.

Adapted from upstream release notes here:
https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.14.1.md#utxo-memory-accounting
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Simon 2018-01-19 16:52:25 -08:00
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@ -4,3 +4,9 @@ release-notes at release time)
Notable changes
===============
UTXO memory accounting
----------------------
The default -dbcache has been changed in this release to 450MiB. Users can set -dbcache to a higher value (e.g. to keep the UTXO set more fully cached in memory). Users on low-memory systems (such as systems with 1GB or less) should consider specifying a lower value for this parameter.
Additional information relating to running on low-memory systems can be found here: [reducing-memory-usage.md](https://github.com/zcash/zcash/blob/master/doc/reducing-memory-usage.md).