Allow unicode characters in doctest.

Author: t-sommer

README.rst

@@ -59,15 +59,15 @@ Read the dataset from the SDF file asserting the correct unit of the dataset and
 
 Get the meta info and data array from the dataset:
 
-    >>> ds_v2.unit
+    >>> ds_v2.unit  # doctest: +ALLOW_UNICODE
     'V'
     >>> ds_v2.data.shape
     (51,)
 
 Get the scale for the first dimension:
 
     >>> ds_t2 = ds_v2.scales[0]
-    >>> ds_t2.unit
+    >>> ds_t2.unit  # doctest: +ALLOW_UNICODE
     's'