Update readme.md
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Merge remote-tracking branch 'origin/dev'

Conflicts:
	corp/readme.md
	mp/readme.md
	readme.md
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Merge pull request #6 from chanxuehong/dev

Dev
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增加 doc.go 文件
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微信支付接口 v2.7
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Dev
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Dev
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Dev
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Merge pull request #15 from chanxuehong/dev

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Merge pull request #16 from chanxuehong/dev

mp/oauth2 做了更改
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