ubuntu install scrapy

使用apt-get安装scrapy后，调试起来总是不对，检查了一下版本，才知道默认安装的版本是0.14.04。o(╯□╰)o
查阅了一下官方文档，这是推荐的安装方法：

1. Import the GPG key used to sign Scrapy packages into APT keyring:

   sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 627220E7

2. Create /etc/apt/sources.list.d/scrapy.list file using the following command:

   echo ‘deb http://archive.scrapy.org/ubuntu scrapy main‘ | sudo tee /etc/apt/sources.list.d/scrapy.list

3. Update package lists and install the scrapy package:

   sudo apt-get update && sudo apt-get install scrapy

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