Upgrade to 2.6.0, add IDNA functions to library (#23)

Author: bbayles

Diff for: ada_url/__init__.py

@@ -1,6 +1,9 @@
 from ada_url.ada_adapter import (
     URL,
     check_url,
+    idna,
+    idna_to_ascii,
+    idna_to_unicode,
     join_url,
     normalize_url,
     parse_url,
@@ -10,6 +13,9 @@
 __all__ = [
     'URL',
     'check_url',
+    'idna',
+    'idna_to_ascii',
+    'idna_to_unicode',
     'join_url',
     'normalize_url',
     'parse_url',