[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-20190424


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

Changes for Build #577
[Jim Unroe <rock.unroe at gmail.com>] [BJ-218] fix valid tuning steps list. #6735

Fixes the following radio models...
Luiton LT725UV
Baojie BJ-218
Hesenate BJ-218
Zastone BJ-218

[Jim Unroe <rock.unroe at gmail.com>] Driver Cleanup: btech.py

1. add btech.py to PEP8 manifest
2. make ptech.py compliant with PEP8

related to #6733