test(issues): add testcase for PR #83

test/issues/#83.parsed_text_links_with_underscores.html

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+<p>plain text link http://test.com/this_has/one.html with underscores</p>
+
+<p>legit·word_with·1·underscore</p>
+
+<p>a word<em>with</em>2underscores (gets em)</p>

test/issues/#83.parsed_text_links_with_underscores.md

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+plain text link http://test.com/this_has/one.html with underscores
+
+legit·word_with·1·underscore
+
+a word_with_2underscores (gets em)