Fixed typo

README.md

@@ -862,7 +862,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 *Libraries for parsing and manipulating texts.*
 
 * Specific Formats
-    * [bbConvert](https://github.com/CalebQ42/bbConvert) - Converts bbCode to HTML that allows you to add support for custo bbCode tags
+    * [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
         * [github_flavored_markdown](https://godoc.org/github.com/shurcooL/github_flavored_markdown) - GitHub Flavored Markdown renderer with fenced code block highlighting, clickable header anchor links.
     * [bluemonday](https://github.com/microcosm-cc/bluemonday) - HTML Sanitizer