D18734: Update octave.xml to Octave 4.2.0

[Nikita Sirgienko]

sirgienko marked an inline comment as done.

REPOSITORY
  R216 Syntax Highlighting

REVISION DETAIL
  https://phabricator.kde.org/D18734

To: sirgienko, #framework_syntax_highlighting
Cc: dhaumann, kwrite-devel, kde-frameworks-devel, bmortimer, hase, michaelh, genethomas, ngraham, bruns, demsking, cullmann, vkrause, sars
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