Fix equality tests for Python 3.x

Since map() returns generator in 3.x, it's not possible to compare them
without unwrap.

Author: kxepal

jsonpatch.py

@@ -328,7 +328,7 @@ def to_string(self):
 
     @property
     def _ops(self):
-        return map(self._get_operation, self.patch)
+        return tuple(map(self._get_operation, self.patch))
 
     def apply(self, obj, in_place=False):
         """Applies the patch to given object.