解决You are using pip version 9.0.1, however version 18.0 is available. You should consider upgrading

Linux版本:Centos7 64位 安装scrapy框架用于写python爬虫时出现警告: You are using pip version 9.0.1, however version 18.0 is available. You should consider upgrading via the 'pip install --upgrade pip' command.   意思是版本低,
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