我在Repl.it上使用pip3 install --upgrade pip3命令升级pip时遇到问题，并且出现此错误：
Repl.it: Installing fresh packages
Usage: pip3 [options]
pip3: error: no such option: --upgrade
You are using pip version 9.0.1, however version 19.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Repl.it: package installation failed!
如何在Repl.it上升级点子？