[stable-2] Drop support for Ansible 2.9 and ansible-base 2.10 (#343)

[Andersson007]

• Drop support for Ansible 2.9 and ansible-base 2.10

• Improve README

(cherry picked from commit eff87f9)

SUMMARY

Backport of #343

[codecov]

Codecov Report

Merging #348 (d202c5e) into stable-2 (d61d442) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           stable-2     #348   +/-   ##
=========================================
  Coverage     75.77%   75.77%           
=========================================
  Files            26       26           
  Lines          2291     2291           
  Branches        556      556           
=========================================
  Hits           1736     1736           
  Misses          380      380           
  Partials        175      175           

Impacted Files	Coverage Δ
plugins/module_utils/version.py	100.00% <ø> (ø)

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