Update versions in pom.xml and documentation after 0.5.0 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 #827 (a820f96) into master (a2c7c24) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #827   +/-   ##
=========================================
  Coverage     80.91%   80.91%           
  Complexity     2272     2272           
=========================================
  Files           100      100           
  Lines          5801     5801           
  Branches       1798     1798           
=========================================
  Hits           4694     4694           
  Misses          286      286           
  Partials        821      821           

Flag	Coverage Δ	Complexity Δ
unittests	80.91% <ø> (ø)	0.00 <ø> (ø)

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