Update README.md

Author: oubiwann

README.md

@@ -5,7 +5,7 @@ resources
 ### Written materials for Lisps in Haskell
 (or Haskells written in Lisps)
 
-* 1991-1993 - An [early Haskell](http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/lang/lisp/code/syntax/haskell/0.html) written in Lisp (source as [github import](https://github.com/haskell-lisp/yale-haskell))
+* 1991-1993 - An [early Haskell](http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/lang/lisp/code/syntax/haskell/0.html) written in Lisp (source code: [github import](https://github.com/haskell-lisp/yale-haskell))
 * 2006 - [Writing A Lisp Interpreter In Haskell](http://www.defmacro.org/ramblings/lisp-in-haskell.html)
 * 2006 - present - [Write Yourself a Scheme in 48 Hours](http://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours)
 * 2007 - [Liskell - Haskell Semantics with Lisp Syntax](http://clemens.endorphin.org/ILC07-Liskell-draft.pdf)