liran-funaro / sphinx-markdown-builder / 18529082049

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Declare extension as safe for parallel reading/writing (#38)

When I run sphinx-build with "-j auto" I get this warning:

	WARNING: the sphinx_markdown_builder extension does not
	declare if it is safe for parallel reading, assuming it isn't -
	please ask the extension author to check and make it explicit

Based on https://www.sphinx-doc.org/en/master/extdev/index.html and
a cursory look at the code, I think we should be parallel-safe:
concurrent read/write calls on different documents should not conflict,
and we never write anything to the build environment object ("env").

Let's enable parallel reading/writing explicitly.

If this is wrong, we should disable it explicitly.

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