fix(dev): py3 fixes;

- Fixed some py3 things.

ckanext/recombinant/read_excel.py

@@ -59,7 +59,7 @@ def _filter_bumf(rowiter, header_rows):
     for row in rowiter:
         i += 1
         values = [
-            unescape(c.value) if isinstance(c.value, unicode) else c.value
+            unescape(c.value) if isinstance(c.value, str) else c.value
             for c in row]
         # return next non-empty row
         if not all(_is_bumf(v) for v in values):
@@ -76,7 +76,7 @@ def _is_bumf(value):
     :return: whether the value is filler
     :rtype: bool
     """
-    if type(value) in (unicode, str):
+    if isinstance(value, str):
         return value.strip() == ''
     return value is None