docs: copy the 4.9.3 news item from the release branch

2020-05-24 09:01:53 +02:00 · 2020-05-24 09:01:53 +02:00 · 3162e73540
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+2020.05.23 - GNU nano 4.9.3 "Almendras"
+• One more bug introduced in version 4.9 is fixed: a crash when
+  the terminal screen is resized while at a lock-file prompt.
+
 2020.04.07 - GNU nano 4.9.2 "Mali Lošinj"
 • Another bug introduced in version 4.9 is fixed: a likely crash
  after undoing an <Enter> at the end of leading whitespace.