Changed 'wrote versions to' string.

I changed it to make it applicable whether the picked versions
are printed or not. 'This info has been written to' doesn't work
if this hasn't been printed on the previous lines :-)

src/zc/buildout/buildout.py

@@ -1030,7 +1030,7 @@ class Buildout(DictMixin):
             f = open(self.update_versions_file, 'a')
             f.write('\n'.join(output))
             f.close()
-            print_("This information has been written to " +
+            print_("Picked versions have been written to " +
                    self.update_versions_file)
 
     def setup(self, args):

src/zc/buildout/repeatable.txt

@@ -357,7 +357,7 @@ at the end.
     The following part definition lists the versions picked:
     [versions]
     spam = 2
-    This information has been written to my_versions.cfg
+    Picked versions have been written to my_versions.cfg
 
 The versions file now contains the extra pin: