Typo fixed

Author: Webklex

src/Connection/Protocols/ImapProtocol.php

@@ -516,8 +516,8 @@ public function examineOrSelect(string $command = 'EXAMINE', string $folder = 'I
  case '[UIDNEXT':
  $result['uidnext'] = (int)$tokens[2];
  break;
- case '[NONEXISTENT':
- throw new RuntimeException("folder doesnt exist");
+ case '[NONEXISTENT]':
+ throw new RuntimeException("folder doesn't exist");
  default:
  // ignore
  break;