Update versions in pom.xml and documentation after 0.1.3 release

[github-actions]

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

[codecov]

Codecov Report

Merging #469 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #469   +/-   ##
=========================================
  Coverage     81.74%   81.74%           
  Complexity     1499     1499           
=========================================
  Files            71       71           
  Lines          3731     3731           
  Branches       1203     1203           
=========================================
  Hits           3050     3050           
  Misses          209      209           
  Partials        472      472           

Flag	Coverage Δ	Complexity Δ
unittests	81.74% <ø> (ø)	1499.00 <ø> (ø)

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