Added find() method

[jesper-friis]

Description

As a simple find() method to the Ontology class as a workaround for the Owlready2 search() method that haven't been working for a while.

Type of change

• [ ] Bug fix.
• [x] New feature.
• [ ] Documentation update.
• [ ] Test 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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.87879% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.90%. Comparing base (938dbb4) to head (6d83771).

Files with missing lines	Patch %	Lines
ontopy/ontology.py	87.87%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #807 +/- ## ========================================== + Coverage 72.72% 72.90% +0.17% ========================================== Files 18 18 Lines 3721 3753 +32 ========================================== + Hits 2706 2736 +30 - Misses 1015 1017 +2 ```

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