Fix formatting typos in usage docs

Add missing import

Fixes #474.

Restrict setuptools from executing on Python2

python_requires will be evaluated by setuptools to ensure the package is compatible
with currently active Python interpreter.

Reference: https://packaging.python.org/guides/distributing-packages-using-setuptools/#python-requires

Closes #470
Signed-off-by: Wilson Husin <wilsonehusin@gmail.com>

to prevent overwriting ports configured in ~/.ssh/config
if no port is specified, don't set the port explicitly to 22

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.9.0 to 2.10.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v2.9.0...v2.10.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

doc: py2 removal clean sweep

* Use types instead of imp.new_module.

I can follow up with https://docs.python.org/3/library/importlib.html#importlib.util.module_from_spec if need be.

* use source loader from importlib

* Revert "use source loader from importlib"

This reverts commit 1f255704f7bf618fb7e0432e1fccef6ee22364d4.

* use inspect.getsource, but alas

* placate linter

* use find_spec to resolve a module spec to a file path

* better function naming

* remove outdated comment

fix connection with @ sign in username

Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.8.2 to 3.8.3.
- [Release notes](https://gitlab.com/pycqa/flake8/tags)
- [Commits](https://gitlab.com/pycqa/flake8/compare/3.8.2...3.8.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.2 to 5.4.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/5.4.2...5.4.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [setuptools-scm](https://github.com/pypa/setuptools_scm) from 4.1.1 to 4.1.2.
- [Release notes](https://github.com/pypa/setuptools_scm/releases)
- [Changelog](https://github.com/pypa/setuptools_scm/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pypa/setuptools_scm/compare/v4.1.1...v4.1.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Drop 2.7
* Add 3.7 and 3.8

Under Python 3.8 we can not wrap a File in a Sock.

Note this currently requires Python >= 3.5

Bumps [setuptools-scm](https://github.com/pypa/setuptools_scm) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/pypa/setuptools_scm/releases)
- [Changelog](https://github.com/pypa/setuptools_scm/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pypa/setuptools_scm/compare/v4.1.0...v4.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [setuptools-scm](https://github.com/pypa/setuptools_scm) from 4.0.0 to 4.1.0.
- [Release notes](https://github.com/pypa/setuptools_scm/releases)
- [Changelog](https://github.com/pypa/setuptools_scm/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pypa/setuptools_scm/compare/v4.0.0...v4.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [setuptools-scm](https://github.com/pypa/setuptools_scm) from 3.5.0 to 4.0.0.
- [Release notes](https://github.com/pypa/setuptools_scm/releases)
- [Changelog](https://github.com/pypa/setuptools_scm/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pypa/setuptools_scm/compare/v3.5.0...v4.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v2.8.1...v2.9.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.8.1 to 3.8.2.
- [Release notes](https://gitlab.com/pycqa/flake8/tags)
- [Commits](https://gitlab.com/pycqa/flake8/compare/3.8.1...3.8.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.6.0 to 3.8.1.
- [Release notes](https://gitlab.com/pycqa/flake8/tags)
- [Commits](https://gitlab.com/pycqa/flake8/compare/3.6.0...3.8.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [setuptools-scm](https://github.com/pypa/setuptools_scm) from 1.15.6 to 3.5.0.
- [Release notes](https://github.com/pypa/setuptools_scm/releases)
- [Changelog](https://github.com/pypa/setuptools_scm/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pypa/setuptools_scm/compare/v1.15.6...v3.5.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [attrs](https://github.com/python-attrs/attrs) from 19.1.0 to 19.3.0.
- [Release notes](https://github.com/python-attrs/attrs/releases)
- [Changelog](https://github.com/python-attrs/attrs/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/python-attrs/attrs/compare/19.1.0...19.3.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.4.2 to 5.4.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/3.4.2...5.4.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>