Make __imod__ explicitly call __mod__

Author: 1st1

src/future/types/newbytes.py

@@ -194,6 +194,9 @@ def __mod__(self, vals):
 
         return _builtin_bytes.__mod__(self, vals)
 
+    def __imod__(self, other):
+        return self.__mod__(other)
+
     def join(self, iterable_of_bytes):
         errmsg = 'sequence item {0}: expected bytes, {1} found'
         if isbytes(iterable_of_bytes) or istext(iterable_of_bytes):