rio-pmtiles python package [#338] (#542)

Add rio-pmtiles command line tool. [#338]

This is derived from the original mapbox/rio-mbtiles implementation, with changes:

* output PMTiles only instead of MBTiles.
* Python 3.7+ only.
* remove --implementation, --image-dump, --append/--overwrite, --covers features.
* bump dependency versions.
* better progress reporting; add pyroaring. 
* update README and license texts.
* rio-pmtiles v0.0.6 on PyPI

python/pmtiles/setup.py

@@ -0,0 +1,24 @@
+import setuptools
+
+with open("README.md", "r") as fh:
+    long_description = fh.read()
+
+setuptools.setup(
+    name="pmtiles",
+    version="3.4.1",
+    author="Brandon Liu",
+    author_email="brandon@protomaps.com",
+    description="Library and utilities to write and read PMTiles archives - cloud-optimized archives of map tiles.",
+    license="BSD-3-Clause",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+    url="https://github.com/protomaps/pmtiles",
+    packages=setuptools.find_packages(),
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: BSD License",
+        "Operating System :: OS Independent",
+    ],
+    scripts=["bin/pmtiles-convert", "bin/pmtiles-serve", "bin/pmtiles-show"],
+    requires_python=">=3.0",
+)