fix: original_index attribute of OptimizedDirection can't be a property (#163)

* fix: original_index attribute of OptimizedDirection

* docs: add OptimizedDirection in doc index

Author: mthh

docs/index.rst

@@ -136,6 +136,9 @@ Data
 .. autoclass:: routingpy.expansion.Edge
     :members: geometry, distance, duration, cost, edge_id, status
 
+.. autoclass:: routingpy.optimized.OptimizedDirection
+    :members: geometry, duration, distance, km, mi, original_index
+
 .. autofunction:: routingpy.utils.decode_polyline5
 
 .. autofunction:: routingpy.utils.decode_polyline6

routingpy/optimized.py

@@ -23,7 +23,7 @@
 class OptimizedDirection(object):
     """
     Contains a parsed optimized_directions's response. Access via properties ``geometry``, ``duration``, ``distance``
-    and ``original_indices``.
+    and ``original_index``.
     """
 
     def __init__(self, geometry=None, duration=None, distance=None, original_indices=None, raw=None):
@@ -97,7 +97,6 @@ def mi(self) -> float:
         """
         return self.distance * 0.0006213712
 
-    @property
     def original_index(self, reordered_index: int) -> int:
         """
         The original (input) location index for the ``reordered_index`` element of the response locations.