Postinstall

[hugohua]

1. 新增postinstall 钩子
2. 完善一下文档
3. 调整内网api接口为 alibaba-inc.com 域名

[codecov-io]

Codecov Report

Merging #36 into master will not change coverage.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   71.62%   71.62%           
=======================================
  Files          32       32           
  Lines        1022     1022           
  Branches      202      202           
=======================================
  Hits          732      732           
  Misses        290      290

Impacted Files	Coverage Δ
packages/fie-npm/lib/index.js	58.49% <33.33%> (ø)	⬆️

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