Update readme.md

Nils Langner · Nils Langner · commit e5d9e7da1504 · 2014-03-24T08:35:17.000+01:00
diff --git a/readme.md b/readme.md
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 # VisualCeption
-Visual regression tests integrated in Codeception.
+Visual regression tests integrated in [Codeception](http://codeception.com/).
 
 ## Documenation todo
 * run twice
