Fix typo and add links

Author: grahammiln

README.md

@@ -3,13 +3,15 @@ go-md2man
 
 Converts markdown into roff (man pages).
 
-Uses blackfriday to process markdown into man pages.
+Uses [blackfriday](https://github.com/russross/blackfriday) to process markdown into man pages.
 
 ### Usage
 
+```
 ./md2man -in /path/to/markdownfile.md -out /manfile/output/path
+```
 
 ### How to contribute
 
 We use go modules to manage dependencies.
-As such you must be using at lest go1.11.
+As such you must be using at least go1.11.