Merge pull request #201 from TheHippo/patch-1

Added familar godoc.org badge

README.org

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 * XSLX
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+[[https://godoc.org/github.com/tealeg/xlsx][https://godoc.org/github.com/tealeg/xlsx?status.svg]]
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 ** Introduction
 xlsx is a library to simplify reading and writing the XML format used
 by recent version of Microsoft Excel in Go programs.