pmtiles_to_dir throwing error 'read' is not defined

[bayre]

From a quick look at the history it seems this error may have snuck in to version 2.0.0

I swapped out lines 88-89 for lines 64-67 and it worked as expected :)

PMTiles/python/pmtiles/convert.py

Lines 88 to 89 in d3dbce0

	with read(input) as reader:
	metadata = reader.metadata

PMTiles/python/pmtiles/convert.py

Lines 64 to 67 in d3dbce0

	with open(input, "r+b") as f:
	source = MmapSource(f)
	reader = Reader(source)
	metadata = reader.header().metadata

[bdon]

thanks, was an oversight - want to open a PR?

[bayre]

sure, I just opened #55