Rigel 1.3.1

(Nexa) performance/efficiency improvements
I'm aware there are issues with Zil mining and will look into them (no ETA unfortunately).
Please don't try to mine Zil until those are addressed.

https://github.com/rigelminer/rigel/releases/tag/1.3.1

Check all links with this post from the developer.
https://bitcointalk.org/index.php?topic=5424675.msg61370527#msg61370527

some tests
https://bitcointalk.org/index.php?topic=5436941.msg61662844#msg61662844