message: Add env autocompletion inside \end{}
diff: @@ -206,7 +206,7 @@ export class Completer implements vscode.CompletionItemProvider {
  provider = this.reference
  break
  case 'environment':
  - reg = /(?:\\begin(?:\[[^[\]]*\])?){([^}]*)$/
  + reg = /(?:\\begin|\\end){([^}]*)$/
  provider = this.environment
  break
  case 'command':
  