missing cmake dependency

[millarm]

Clean install following the readme has this error

Running setup.py install for atari-py ... error
Complete output from command /Users/millarm/miniconda3/envs/universe-starter-agent/bin/python -u -c "import setuptools, tokenize;file='/private/var/folders/kq/gklfsgfd4fq8yc00kj3sg5zm0000gn/T/pip-build-3f_kk38_/atari-py/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /var/folders/kq/gklfsgfd4fq8yc00kj3sg5zm0000gn/T/pip-j9a7ikbv-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
mkdir -p build && cd build && cmake .. && make -j4
/bin/sh: cmake: command not found
make: *** [build] Error 127

On OSX

Simply fixed by adding

brew install cmake

To the instructions