fix error report bug

contrib/supervise-v

@@ -76,7 +76,7 @@ class Argset:
             'vrad': BspCompileArgset,
         }
         if bin_name not in BINMAP:
-            raise NotImplementedError('no argset supervisor for bin %r'.format(bin_name))
+            raise NotImplementedError('no argset supervisor for bin {!r}'.format(bin_name))
         logging.info('Argset for %r', bin_name)
         return  BINMAP[bin_name](argv)