[chirp_users] New Daily Build

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@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@gmail.com] Driver Cleanup: btech.py

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

related to #6733