Revert version to v0.5.0

[CasperWA]

The release for v0.5.1 failed, therefore, revert version number.

Description:

Type of change:

• Bug fix.
• New feature.
• Documentation update.

Checklist:

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments:

[CasperWA]

Will force merge this to revert the version number in order to be able to create a new v0.5.1 release.
Not possible :)

[codecov-commenter]

Codecov Report

Merging #544 (20a2dec) into master (b6e0c11) will not change coverage.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master     #544   +/-   ##
=======================================
  Coverage   65.85%   65.85%           
=======================================
  Files          16       16           
  Lines        3099     3099           
=======================================
  Hits         2041     2041           
  Misses       1058     1058           

Impacted Files	Coverage Δ
ontopy/__init__.py	80.00% <100.00%> (ø)

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