Merge pull request biolab#1898 from ales-erjavec/fixes/serialize-lite…

…ral-bytes

[FIX]canvas/readwrite: Fix byte literal serialization
(cherry picked from commit 53c81fd)

Orange/canvas/scheme/readwrite.py

@@ -1004,7 +1004,7 @@ def literal_dumps(obj, prettyprint=False, indent=4):
     NoneType = type(None)
 
     def check(obj):
-        if type(obj) in [int, int, float, bool, NoneType, str, str]:
+        if type(obj) in [int, float, bool, NoneType, str, bytes]:
             return True
 
         if id(obj) in memo: