Remove t.co

去除Twitter对外链的t.co跳转

在Firefox Nightly 59的Violentmonkry，Tampermonkey上测试通过

Name		Name	Last commit message	Last commit date
Latest commit History 26 Commits
LICENSE		LICENSE
README.md		README.md
en-us.md		en-us.md
removetco.user.js		removetco.user.js

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