Fix undefined method Logger when processing watched file notifications

[vinistock]

The code for handling watched file notifications was crashing every time because it was trying to invoke Logger(), which is a module not a method. The actual method is Logger.log.

I added a test to verify that the runtime adapter is properly reloaded whenever the config file is updated.

Note: I did not use an RSpec's subject block for this test because we need to verify things inside the with_server block, while add-ons are still loaded and activated (the method unloads them at the end). The watched files notification doesn't return a response (because it's an LSP notification and not a request) and so this is the only way to verify what's happening.

Please let me know if you want to include this in the changelog.

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• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
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• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[koic]

Thank you for finding the issue. Can you add a changelog entry? And the CI is failing, can you also fix it?

[vinistock]

Done!

[koic]

Thanks!