Unclear license status for project

[jburkal]

In commit 6bc1a1a, the project changed from a Creative Commons license to GPL-3.0, as seen in its LICENSE.md file:

uradmonitor_smoggie/LICENSE.md

Lines 1 to 2 in 6bc1a1a

	GNU GENERAL PUBLIC LICENSE
	Version 3, 29 June 2007

However, in commit 51c5c49 several files changed license to a proprietary one.
For example, calibration.cpp changed from:

uradmonitor_smoggie/code/smoggie/calibration.cpp

Line 3 in 6bc1a1a

* License: GPL v3

to:

uradmonitor_smoggie/code/smoggie/calibration.cpp

Line 4 in 51c5c49

* License: Proprietary, all rights reserved.

This is the case for the following files:

• code/smoggie/calibration.cpp
• code/smoggie/calibration.h
• code/smoggie/src/data/data_ex.cpp
• code/smoggie/src/data/data_ex.h
• code/smoggie/src/drivers/drv_pms_generic.cpp
• code/smoggie/src/drivers/drv_pms_generic.h

If this was an intentional change then the LICENSE.md file should be updated to a more appropriate license. If it was just a mistake, then it would be nice to have the affected files updated to the GPL-3.0 license.