Update versions in pom.xml and documentation after 0.5.2 release

[github-actions]

• Versions are updated in pom.xml, README.md and in examples
• Current project version is incremented to the next snapshot

[codecov]

Codecov Report

Merging #867 (d962d0d) into master (8832cf3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #867   +/-   ##
=========================================
  Coverage     80.52%   80.52%           
  Complexity     2208     2208           
=========================================
  Files           101      101           
  Lines          5669     5669           
  Branches       1751     1751           
=========================================
  Hits           4565     4565           
  Misses          257      257           
  Partials        847      847           

Flag	Coverage Δ	Complexity Δ
unittests	80.52% <ø> (ø)	2208.00 <ø> (ø)

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