added subtitle to "Text Processing"

README.md

@@ -348,6 +348,8 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 
 ## Text Processing
 
+*Libraries for parsing and manipulating texts.*
+
 * Specific Formats
     * [blackfriday](https://github.com/russross/blackfriday) - Markdown processor in Go
         * [github_flavored_markdown](http://godoc.org/github.com/shurcooL/go/github_flavored_markdown) - GitHub Flavored Markdown renderer in Go.
@@ -410,6 +412,8 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 
 ### Middlewares
 
+*Libraries for creating HTTP middlewares.*
+
 * [alice](https://github.com/justinas/alice) - Painless middleware chaining for Go.
 * [muxchain](https://github.com/stephens2424/muxchain) - Lightweight middleware for net/http.
 * [negroni](https://github.com/codegangsta/negroni) - Idiomatic HTTP Middleware for Golang.