Missing requirement for ASE / Inaccurate "Getting Started"

Summary

"Getting Started" seems to be outdated, (1) requesting python 2, when setup.py requires 3.6 or higher (2) installation with ./setup.py ... instead of pip install ., and (3) if pip install is used, the path to dynasor is added automatically. After installation, running dynasor --help result in the error: "ModuleNotFoundError: No module named 'ase'"

Steps to reproduce

View Getting Started docs, install dynasor, and use dynasor --help in the terminal resulting in an error.

What is the current bug behavior?

Less than python 3.6 results in an error, use of dynasor --help results in "ModuleNotFoundError: No module named 'ase'"

What is the expected correct behavior?

Documentation should reflect proper use of the setup file. setup file should install all requirements or alert the user of missing packages.

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)

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