md_tw.py: Rename TWRenderer._tw_set_options method.

* md_tw.py (TWRenderer)[_tw_set_options]: Remove method.
[tw_set]: New method.
* tests/test_md_tw.py(TestTWRenderer)
[test_tw_set_options_with_valid_opts]: Remove test.
[test_tw_set_with_valid_opts]: Add test.
[test_tw_set_options_with_invalid_opts]: Remove test.
[test_tw_set_with_invalid_opts]: Add test.

1 files changed, 2 insertions, 2 deletions

diff --git a/md_tw.py b/md_tw.py
index acde6a5..4b833ba 100644
--- a/md_tw.py
+++ b/md_tw.py
@@ -225,7 +225,7 @@ class TWRenderer(mistune.Renderer):
         )
 
 
-    def _tw_set_options(self, **kwargs):
+    def tw_set(self, **kwargs):
         """
         Set options for the local textwrap.TextWrapper instance.
         """
@@ -248,7 +248,7 @@ class TWRenderer(mistune.Renderer):
     def _tw_fill(self, text, **kwargs):
         """Wrap text.
         """
-        self._tw_set_options(**kwargs)
+        self.tw_set(**kwargs)
         return self.tw.fill(text)