Tiny fix for Python3

lark/__init__.py

@@ -3,4 +3,4 @@ from .common import ParseError, GrammarError
 from .lark import Lark
 from .utils import inline_args
 
-__version__ = "0.3.5"
+__version__ = "0.3.6"

lark/parsers/earley.py

@@ -69,6 +69,7 @@ class Item(object):
 
 class Item_JoinDerivations(Item):
     __eq__ = Item.similar
+    __hash__ = Item.__hash__
 
 
 class NewsList(list):