[chirp_users] New Daily Build

[Build System]

Greetings,

A new daily build of CHIRP is available.  This includes changes made
directly to the tree yesterday, and may include additional features,
bug fixes, and/or bugs.  If you are interested in trying it, grab it
from the following location:

  http://trac.chirp.danplanet.com/chirp_daily/daily-20190516


A list of the changes included in this build (since the last daily)
follows:

Changes for Build #580
[Pavel Milanes (CO7WT) <pavelmc at gmail.com>] [KG-UV8E] Fix the missing step declarations, fixes #6785

STEP var was declared but not used, now it's passed via rf.valid_tuning_steps