return package's install requires

def get_install_requires():
    """return package's install requires"""
    base = os.path.abspath(os.path.dirname(__file__))
    requirements_file = os.path.join(base, 'requirements.txt')
    if not os.path.exists(requirements_file):
        return []
    with open(requirements_file, mode='rt', encoding='utf-8') as f:
        return f.read().splitlines()