Update README.md

README.md

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 # Oberon 07 compiler
 
 Written in JavaScript (and partially on oberon itself) and transaltes Oberon to JavaScript code so it can be run in web browser.
-Supports both "pure" and "plus extensions" mode. Pure mode is a strict implementation of original Oberon language report. Language [extensions](/vladfolts/oberonjs/wiki/Eberon) implemented in my own way and available as a separate compiler mode.
+Supports both "pure" and "plus extensions" mode. Pure mode is a strict implementation of original Oberon language report. Language [extensions](https://github.com/vladfolts/oberonjs/wiki/Eberon) implemented in my own way and available as a separate compiler mode.
 
 ## Quick start
 You can try the compiler online [here](http://oberspace.dyndns.org/oberonjs.html).