specify dependency for boto3 in the correct way for multiple version specifiers (#761)
specify dependency for boto3 in the correct way for multiple version specifiers (#761)

see https://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-dependencies

Co-authored-by: Tom Ritserveldt <01115c38346ed5866cd6b1684dc6fbec7da4ceb2@gmail.com>
remind101/stacker,remind101/stacker