fix typo (doubled word)

git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@68862 62d5b8a3-27da-0310-9561-8e5933582275

README.txt

@@ -93,5 +93,5 @@ buildout.txt
    to write recipes.
 
 easy_install.txt
-   Describes an Python APIs for invoking easy_install for for
-   generation of scripts with paths baked into them.
+   Describes an Python APIs for invoking easy_install for generation
+   of scripts with paths baked into them.