message: Use the new #optional-arg approach for usepackage and documentclass
diff: </dict>
  <dict>
  <key>begin</key>
  - <string>((\\)(?:usepackage|documentclass))(?:(\[)([^\]]*)(\]))?(\{)</string>
  + <string>((\\)(?:usepackage|documentclass))((?:\[[^\[]*?\])*)(\{)</string>
  <key>beginCaptures</key>
  <dict>
  <key>1</key>
  </dict>
  <key>3</key>
  <dict>
  - <key>name</key>
  - <string>punctuation.definition.arguments.begin.latex</string>
  - </dict>
  - <key>4</key>
  + <key>patterns</key>
  + <array>
  <dict>
  - <key>name</key>
  - <string>variable.parameter.latex</string>
  + <key>include</key>
  + <string>#optional-arg</string>
  </dict>
  - <key>5</key>
  - <dict>
  - <key>name</key>
  - <string>punctuation.definition.arguments.end.latex</string>
  + </array>
  </dict>
  - <key>6</key>
  + <key>4</key>
  <dict>
  <key>name</key>
  <string>punctuation.definition.arguments.begin.latex</string>
  