“python_requires” should be set with “>=3.6”, as litecli 1.9.0 is not compatible with all Python versions

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Currently, the keyword argument python_requires of setup() is not set, and thus it is assumed that this distribution is compatible with all Python versions.
However, I found it is not compatible with Python<3.6. My local Python version is 3.5, and I encounter the following error when executing “pip install litecli==1.9.0”

Collecting litecli==1.9.0
  Downloading litecli-1.9.0-py2.py3-none-any.whl (47 kB)
     |████████████████████████████████| 47 kB 415 kB/s 
Collecting Pygments>=1.6
  Downloading Pygments-2.11.2-py3-none-any.whl (1.1 MB)
     |████████████████████████████████| 1.1 MB 639 kB/s 
Collecting click>=4.1
  Downloading click-7.1.2-py2.py3-none-any.whl (82 kB)
     |████████████████████████████████| 82 kB 417 kB/s 
ERROR: Could not find a version that satisfies the requirement prompt-toolkit<4.0.0,>=3.0.3 (from litecli==1.9.0) (from versions: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.25, 0.26, 0.28, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.13, 1.0.14, 1.0.15, 1.0.16, 1.0.17, 1.0.18, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10)
ERROR: No matching distribution found for prompt-toolkit<4.0.0,>=3.0.3 (from litecli==1.9.0)

Dependencies of this distribution are listed as follows:

    "click >= 4.1",
    "Pygments>=1.6",
    "prompt_toolkit>=3.0.3,<4.0.0",
    "sqlparse",
    "configobj >= 5.0.5",
    "cli_helpers[styles] >= 2.2.1",

I found that prompt_toolkit>=3.0.3,<4.0.0 requires Python>=3.6.2, which results in installation failure of litecli in Python3.5.

Way to fix:
modify setup() in setup.py, add python_requires keyword argument:

setup(…
     python_requires='>=3.6.2'
     …)

Thanks for your attention.
Best regrads,
PyVCEchecker