Fix typo

README

@@ -124,7 +124,7 @@ wrapper     :: generates a set of wrapper executables for a given ruby with the
 cleanup     :: Lets you remove stale source folders / archives and other
                miscellaneous data associated with rvm.
 repair      :: Lets you repair parts of your environment e.g. wrappers, env
-               files and and similar files (e.g. general maintenance).
+               files and similar files (e.g. general maintenance).
 fix-permissions :: Repairs broken permissions (e.g. by sudo or chef)
 osx-ssl-certs :: Helps update certificates for OpenSSL installed by rvm on OSX.
 snapshot    :: Lets you backup / restore an rvm installation in a lightweight