Style checker tries to check the style of README.txt.py in the build folder

[Yamboy1]

For some reason, running ./dev style throws a warning that it cannot parse the file README.txt.py in the build folder:
WARNING: Error in file ./build/img/at_home/unlocking-the-secret-in-product-codes/README.txt.py: Cannot parse file.

To reproduce, run ./dev update and then ./dev style. The style check should probably be limited so as to not try and check for build folder.