Add NEWS bullet

[skip ci]

Author: cderv

NEWS.md

@@ -1,6 +1,8 @@
 rticles 0.20
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+- Fix issue with Pandoc's citation processing by updating all templates with last relevant changes from Pandoc's default template (thanks, @BlackEdder, @dahrens, #390)
+
 - remove warning in `joss_article()` about `citation_package` (thanks, @llrs, #389).
 
 - fix an issue with `rjournal_article()` template to insert newline in author's block only if a field exist (thanks, @huizezhang-sherry, #387)