Compiling on MacOS Catalina + Homebrew: update README.md #232
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This updates README.md with detailed and well tested instructions for compiling
python-mapnik
on MacOS Catalina systems using the very common homebrew packages.This is a surprisingly difficult task as of Sep 2020, with a few time consuming gotchas. Three of us have spent a couple days each getting this working, seemed worth documenting at the README level for others, without the detailed docs python-mapnik is not casually installable on OSX for most people who are not really determined.