Add doi link.
@@ -1048,6 +1048,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
* [bbConvert](https://github.com/CalebQ42/bbConvert) - Converts bbCode to HTML that allows you to add support for custom bbCode tags.
* [blackfriday](https://github.com/russross/blackfriday) - Markdown processor in Go.
* [bluemonday](https://github.com/microcosm-cc/bluemonday) - HTML Sanitizer.
+ * [doi](https://github.com/hscells/doi) - Document object identifier (doi) parser in Go.
* [editorconfig-core-go](https://github.com/editorconfig/editorconfig-core-go) - Editorconfig file parser and manipulator for Go.
* [enca](https://github.com/endeveit/enca) - Minimal cgo bindings for [libenca](http://cihar.com/software/enca/).
* [genex](https://github.com/alixaxel/genex) - Count and expand Regular Expressions into all matching Strings.
