message: Honor case setting when building completion items
diff: @@ -122,7 +122,7 @@ export class BibtexCompleter implements vscode.CompletionItemProvider {
  // Find the longest field name in entry
  let s: string = itemName + '{${0:key}'
  itemFields.forEach(field => {
  - s += ',\n' + config.tab + (config.case === 'lowercase' ? field : field.toUpperCase())
  + s += ',\n' + config.tab + (config.case === 'lowercase' ? field.toLowerCase() : field.toUpperCase())
  s += ' '.repeat(maxLengths[itemName] - field.length) + ' = '
  s += config.left + `$${count}` + config.right
  count++
  