Revert "Add unicode encoding for handling text attachments"

This reverts commit b0b522c.

src/cloudant/document.py

@@ -20,7 +20,7 @@
 import requests
 from requests.exceptions import HTTPError
 
-from ._2to3 import unicode_, url_quote, url_quote_plus
+from ._2to3 import url_quote, url_quote_plus
 from .errors import CloudantException
 
 
@@ -406,11 +406,11 @@ def get_attachment(
 
         if write_to is not None:
             if attachment_type == 'text' or attachment_type == 'json':
-                write_to.write(unicode_(resp.text))
+                write_to.write(resp.text)
             else:
                 write_to.write(resp.content)
         if attachment_type == 'text':
-            return unicode_(resp.text)
+            return resp.text
         elif attachment_type == 'json':
             return resp.json()